out of the transaction or occurrence that is the subject matter of the plaintiff's claim against the third-party plaintiff. The plaintiff may assert any claim against the third-party defendant arising out of the transaction or occurrence that is the subject matter of the plaintiff's claim against the third-party plaintiff, and the third-party defendant thereupon shall assert his defenses as provided in Rule 12 and his counterclaims and cross-claims as provided in Rule 13. A third-party defendant may proceed under this rule against any person not a party to the action who is or may be liable to him for all or part of the claim made in the action against the third-party defendant.

(b) WHEN PLAINTIFF MAY BRING IN THIRD PARTY. When a counterclaim is asserted against a plaintiff, he may cause a third party to be brought in under circumstances which under this rule would entitle a defendant to do so.

(As amended Dec. 27, 1946, eff. Mar. 19, 1948.)

Rule 15. Amended and Supplemental Pleadings.

(a) AMENDMENTS. A party may amend his pleading once as a matter of course at any time before a responsive pleading is served or, if the pleading is one to which no responsive pleading is permitted and the action has not been placed upon the trial calendar, he may so amend it at any time within 20 days after it is served. Otherwise a party may amend his pleading only by leave of court or by written consent of the adverse party; and leave shall be freely given when justice so requires. A party shall plead in response to an amended pleading within the time remaining for response to the original pleading or within 10 days after service of the amended pleading, whichever period may be the longer, unless the court otherwise orders.

(b) AMENDMENTS TO CONFORM TO THE EVIDENCE. When issues not raised by the pleadings are tried by express or implied consent of the parties, they shall be treated in all respects as if they had been raised in the pleadings. Such amendment of the pleadings as may be necessary to cause them to conform to the evidence and to raise these issues may be made upon motion of any party at any time, even after judgment; but failure so to amend does not affect the result of the trial of these issues. If evidence is objected to at the trial on the ground that it is not within the issues made by the pleadings, the court may allow the pleadings to be amended and shall do so freely when the presentation of the merits of the action will be subserved thereby and the objecting party fails to satisfy the court that the admission of such evidence would prejudice him in maintaining his action or defense upon the merits. The court may grant a continuance to enable the objecting party to meet such evidence.

(c) RELATION BACK OF AMENDMENTS. Whenever the claim or defense asserted in the amended pleading arose out of the conduct, transaction, or occurrence set forth or attempted to be set forth in the original pleading, the amendment relates back to the date of the original pleading.

(d) SUPPLEMENTAL PLEADINGS. Upon motion of a party the court may, upon reasonable notice and upon such terms as are just, permit him to serve a supplemental pleading setting forth transactions or occurrences or events which have happened since the date of the pleading sought to be supplemented. If the court deems it advisable that the adverse party plead thereto, it shall so order, specifying the time therefor.

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Rule 16. Pre-Trial Procedure; Formulating Issues. In any action, the court may in its discretion direct the attorneys for the parties to appear before it for a conference to consider

(1) The simplification of the issues;

(2) The necessity or desirability of amendments to the pleadings;

(3) The possibility of obtaining admissions of fact and of documents which will avoid unnecessary proof;

(4) The limitation of the number of expert witnesses;

(5) The advisability of a preliminary reference of issues to a master for findings to be used as evidence when the trial is to be by jury;

(6) Such other matters as may aid in the disposition of the

action.

The court shall make an order which recites the action taken at the conference, the amendments allowed to the pleadings, and the agreements made by the parties as to any of the matters considered, and which limits the issues for trial to those not disposed of by admissions or agreements of counsel; and such order when entered controls the subsequent course of the action, unless modified at the trial to prevent manifest injustice. The court in its discretion may establish by rule a pre-trial calendar on which actions may be placed for consideration as above provided and may either confine the calendar to jury actions or to non-jury actions or extend it to all actions.

IV. PARTIES

Rule 17. Parties Plaintiff and Defendant; Capacity.

(a) REAL PARTY IN INTEREST. Every action shall be prosecuted in the name of the real party in interest; but an executor, administrator, guardian, trustee of an express trust, a party with whom or in whose name a contract has been made for the benefit of another, or a party authorized by statute may sue in his own name without joining with him the party for whose benefit the action is brought; and when a statute of the United States so provides, an action for the use or benefit of another shall be brought in the name of the United States.

(b) CAPACITY TO SUE OR BE SUED. The capacity of an individual, other than one acting in a representative capacity, to sue or be sued shall be determined by the law of his domicile. The capacity of a corporation to sue or be sued shall be determined by the law under which it was organized. In all other cases capacity to sue or be sued shall be determined by the law of the state in which the district court is held, except (1) that a partnership or other unincorporated association, which has no such capacity by the law of such state, may sue or be sued in its common name for the purpose of enforcing for or against it a substantive right existing under the Constitution or laws of the United States, and (2) that the capacity of a receiver appointed by a court of the United States to sue or be sued in a court of the United States is governed by Title 28, U. S. C., §§ 754 and 959 (a).

(c) INFANTS OR INCOMPETENT PERSONS. Whenever an infant or incompetent person has a representative, such as a general guardian, committee, conservator, or other like fiduciary, the representative may

sue or defend on behalf of the infant or incompetent person. If an infant or incompetent person does not have a duly appointed representative he may sue by his next friend or by a guardian ad litem. The court shall appoint a guardian ad litem for an infant or incompetent person not otherwise represented in an action or shall make such other order as it deems proper for the protection of the infant or incompetent person.

(As amended Dec. 27, 1946, eff. Mar. 19, 1948; Dec. 29, 1948, eff. Oct. 20, 1949.)

Rule 18. Joinder of Claims and Remedies.

(a) JOINDER OF CLAIMS. The plaintiff in his complaint or in a reply setting forth a counterclaim and the defendant in an answer setting forth a counterclaim may join either as independent or as alternate claims as many claims either legal or equitable or both as he may have against an opposing party. There may be a like joinder of claims when there are multiple parties if the requirements of Rules 19, 20 and 22 are satisfied. There may be a like joinder of cross-claims or third-party claims if the requirements of Rules 13 and 14 respectively are satisfied.

(b) JOINDER OF REMEDIES; FRAUDULENT CONVEYANCES. Whenever a claim is one heretofore cognizable only after another claim has been prosecuted to a conclusion, the two claims may be joined in a single action; but the court shall grant relief in that action only in accordance with the relative substantive rights of the parties. In particular, a plaintiff may state a claim for money and a claim to have set aside a conveyance fraudulent as to him, without first having obtained a judgment establishing the claim for money.

Rule 19. Necessary Joinder of Parties.

(a) NECESSARY JOINDER. Subject to the provisions of Rule 23 and of subdivision (b) of this rule, persons having a joint interest shall be made parties and be joined on the same side as plaintiffs or defendants. When a person who should join as a plaintiff refuses to do so, he may be made a defendant or, in proper cases, an involuntary plaintiff.

(b) EFFECT OF FAILURE TO JOIN. When persons who are not indispensable, but who ought to be parties if complete relief is to be accorded between those already parties, have not been made parties and are subject to the jurisdiction of the court as to both service of process and venue and can be made parties without depriving the court of jurisdiction of the parties before it, the court shall order them summoned to appear in the action. The court in its discretion may proceed in the action without making such persons parties, if its jurisdiction over them as to either service of process or venue can be acquired only by their consent or voluntary appearance or if, though they are subject to its jurisdiction, their joinder would deprive the court of jurisdiction of the parties before it; but the judgment rendered therein does not affect the rights or liabilities of absent persons.

(c) SAME: NAMES OF OMITTED PERSONS AND REASONS FOR NONJOINDER TO BE PLEADED. In any pleading in which relief is asked, the pleader shall set forth the names, if known to him, of persons who ought to be parties if complete relief is to be accorded between those already parties, but who are not joined, and shall state why they are omitted.

Rule 20. Permissive Joinder of Parties.

(a) PERMISSIVE JOINDER. All persons may join in one action as plaintiffs if they assert any right to relief jointly, severally, or in the

alternative in respect of or arising out of the same transaction, occurrence, or series of transactions or occurrences and if any question of law or fact common to all of them will arise in the action. All persons may be joined in one action as defendants if there is asserted against them jointly, severally, or in the alternative, any right to relief in respect of or arising out of the same transaction, occurrence, or series of transactions or occurrences and if any question of law or fact common to all of them will arise in the action. A plaintiff or defendant need not be interested in obtaining or defending against all the relief demanded. Judgment may be given for one or more of the plaintiffs according to their respective rights to relief, and against one or more defendants according to their respective liabilities.

(b) SEPARATE TRIALS. The court may make such orders as will prevent a party from being embarrassed, delayed, or put to expense by the inclusion of a party against whom he asserts no claim and who asserts no claim against him, and may order separate trials or make other orders to prevent delay or prejudice.

Rule 21. Misjoinder and Non-Joinder of Parties. Misjoinder of parties is not ground for dismissal of an action. Parties may be dropped or added by order of the court on motion of any party or of its own initiative at any stage of the action and on such terms as are just. Any claim against a party may be severed and proceeded with separately.

Rule 22. Interpleader.

(1) Persons having claims against the plaintiff may be joined as defendants and required to interplead when their claims are such that the plaintiff is or may be exposed to double or multiple liability. It is not ground for objection to the joinder that the claims of the several claimants or the titles on which their claims depend do not have a common origin or are not identical but are adverse to and independent of one another, or that the plaintiff avers that he is not liable in whole or in part to any or all of the claimants. A defendant exposed to similar liability may obtain such interpleader by way of cross-claim or counterclaim. The provisions of this rule supplement and do not in any way limit the joinder of parties permitted in Rule 20.

(2) The remedy herein provided is in addition to and in no way supersedes or limits the remedy provided by Title 28, U. S. C., §§ 1335, 1397, and 2361. Actions under those provisions shall be conducted in accordance with these rules.

(As amended Dec. 29, 1948, eff. Oct. 20, 1949.)

Rule 23. Class Actions.

(a) REPRESENTATION. If persons constituting a class are so numerous as to make it impracticable to bring them all before the court, such of them, one or more, as will fairly insure the adequate representation of all may, on behalf of all, sue or be sued, when the character of the right sought to be enforced for or against the class is

(1) joint, or common, or secondary in the sense that the owner of a primary right refuses to enforce that right and a member of the class thereby becomes entitled to enforce it;

(2) several, and the object of the action is the adjudication of claims which do or may affect specific property involved in the action; or

(3) several, and there is a common question of law or fact affecting the several rights and a common relief is sought.

(b) SECONDARY ACTION BY SHAREHOLDERS. In an action brought to enforce a secondary right on the part of one or more shareholders in an association, incorporated or unincorporated, because the association refuses to enforce rights which may properly be asserted by it, the complaint shall be verified by oath and shall aver (1) that the plaintiff was a shareholder at the time of the transaction of which he complains or that his share thereafter devolved on him by operation of law and (2) that the action is not a collusive one to confer on a court of the United States jurisdiction of any action of which it would not otherwise have jurisdiction. The complaint shall also set forth with particularity the efforts of the plaintiff to secure from the managing directors or trustees and, if necessary, from the shareholders such action as he desires, and the reasons for his failure to obtain such action or the reasons for not making such effort.

(c) DISMISSAL OR COMPROMISE. A class action shall not be dismissed or compromised without the approval of the court. If the right sought to be enforced is one defined in paragraph (1) of subdivision (a) of this rule notice of the proposed dismissal or compromise shall be given to all members of the class in such manner as the court directs. If the right is one defined in paragraphs (2) or (3) of subdivision (a) notice shall be given only if the court requires it.

Rule 24. Intervention.

(a) INTERVENTION OF RIGHT. Upon timely application anyone shall be permitted to intervene in an action: (1) when a statute of the United States confers an unconditional right to intervene; or (2) when the representation of the applicant's interest by existing parties is or may be inadequate and the applicant is or may be bound by a judgment in the action; or (3) when the applicant is so situated as to be adversely affected by a distribution or other disposition of property which is in the custody or subject to the control or disposition of the court or an officer thereof.

(b) PERMISSIVE INTERVENTION. Upon timely application anyone may be permitted to intervene in an action: (1) when a statute of the United States confers a conditional right to intervene; or (2) when an applicant's claim or defense and the main action have a question of law or fact in common. When a party to an action relies for ground of claim or defense upon any statute or executive order, administered by a federal or state governmental officer or agency or upon any regulation, order, requirement, or agreement issued or made pursuant to the statute or executive order, the officer or agency upon timely application may be permitted to intervene in the action. În exercising its discretion the court shall consider whether the intervention will unduly delay or prejudice the adjudication of the rights of the original parties.

(c) PROCEDURE. A person desiring to intervene shall serve a motion to intervene upon all parties affected thereby. The motion shall state the grounds therefor and shall be accompanied by a pleading setting forth the claim or defense for which intervention is sought. The same procedure shall be followed when a statute of the United States gives a right to intervene. When the constitutionality of an act of Congress affecting the public interest is drawn in question in any action to which the United States or an officer, agency, or employee thereof is not a party, the court shall notify the Attorney