“ The many arguments now made to us in support of reversal are reducible to two constitutional challenges. First, it is contended that questioning petitioner on any matters germane to the state criminal charges then pending against him was offensive to the Due Process Clause of the Fifth Amendment. Second, it is argued that the Committee invaded domains constitutionally reserved to the Executive and the Judiciary, in that its inquiry was simply aimed at petitioner's 'exposure' and served no legislative purpose. For reasons now to be discussed we decide that neither challenge is availing. ”

“ Petitioner cannot escape the effect of his waiver by arguing, as he does, that his refusals to answer were based on 'due process' grounds, and not upon a claim of 'privilege.' We agree, of course, that a congressional committee's right to inquire is 'subject to' all relevant 'limitations placed by the Constitution on governmental action,' including 'the relevant limitations of the Bill of Rights,' Barenblatt v. ”

“ It is apparent from the questioning of Raddock by the chief counsel for the McClellan Committee that the Committee had information indicating that Raddock, the petitioner, Blaier, and several officials of the Teamsters Union had been involved in a plan whereby Holovachka had been induced to drop the Lake County grand jury investigation, and Committee counsel explained to Raddock that the Committee was interested to learn whether union funds or influence had been used for that purpose. ”

“ See note 12, Counts 1, 2, 3, 4, 5, 6, 7, 9, 14, 17.↑ In relevant part this statement was:↑ The full statement was:↑ At the contempt trial Senator McClellan explained his statement as follows:↑ Second Interim Report, S.Rep.No.621, pt. 2, 86th Cong., 1st Sess. 592 (1959) . ”