The several district courts of the United States are vested with jurisdiction, for cause shown, to prevent and restrain violations of sections 4402 and 4403 of this title upon application of the Federal Trade Commission in the case of a violation of section 4402 of this title or upon application of the Attorney General of the United States acting through the several United States attorneys in their several districts in the case of a violation of section 4402 or 4403 of this title.