To provide that cases challenging the constitutionality of measures passed by State referendum be heard by a 3-judge court.

[AI summary unavailable — showing source text] Requires that any action brought in or removed to a U.S. district court that challenges the constitutionality of a State law adopted by referendum be heard and determined by a three-judge court and that any appeal of such action be to the Supreme Court. Prohibits a district court or judge thereof from granting an interlocutory or permanent injunction restraining the enforcement, operation, or execution of a State law upon the ground of unconstitutionality unless the application for the injunction is heard and determined by such a three-judge court.…