NLRB Chairman tells Senate that restrictions on Wagner Act will deprive labor of liberties. Washington, D.C., April 18. NLRB Chairman J. Warren Madden, declared today before the Senate Labor Committee that restrictive amendments to the Wagner Act would deprive labor of formerly enjoyed liberties. He denied that the NLRB had shown favoritism to either AF of L or CIO, and said that charges of such favoritism, although frequent, did not make truths 'untruths'