NLRB heads defends agency before senate committee. Washington, D.C., Feb. 3. Defending the National Labor Relations Board today before the senate judiciary committee, Chairman J. Warren Madden Asserted that demands for Congressional investigation by Senator Burke are based on "misinformation, half-truths and trivialities." Madden admitted that the NLRB had made mistakes and has been severely criticized, but added that much of the criticism could have been avoided by compromising the principles of the (Wagner) Act, 2/3/38