2 U.S. Code § 192 defines contempt of Congress. It lets the House or Senate issue subpoenas and punishes willful refusal to comply. That refusal counts as contempt. The Constitution backs this up. Article I, Section 5 gives each chamber the power to punish for contempt. But the legal details sit in the statute. So 2 U.S. Code § 192 is the main tool for charging someone.
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