“Antitrust laws,” as used herein, includes the Act entitled “An Act to protect trade and commerce against unlawful restraints and monopolies,” approved July second, eighteen hundred and ninety; sections seventy-three to seventy-six, inclusive, of an Act entitled “An Act to reduce taxation, to provide revenue for the Government, and for other purposes,” of August twenty-seventh, eighteen hundred and ninety-four; an Act entitled “An Act to amend sections seventy-three and seventy-six of the Act of August twenty-seventh, eighteen hundred and ninety-four, entitled ‘An Act to reduce taxation, to provide revenue for the Government, and for other purposes,’ ” approved February twelfth, nineteen hundred and thirteen; and also this Act.