A Federal District Court lacks jurisdiction to enjoin the Federal Trade Commission from proceeding in an investigation. It cannot stay (stop) a subpoena duces tecum to produce documents in the investigative stage. An injunction by a federal court does not have the power to restrain the FTC from enforcing an order requiring corporations to furnish reports and documents un 15 USC § 49. The only relief available to stop a demand for documents is to seek an action of compliance in mandamus by the Attorney General of the United States, or under 15 USC § 50 to enforce fines and forfeitures.