§ 6002. Immunity generally

Whenever a witness refuses, on the basis of his privilege against self-incrimination, to testify or provide other information in a proceeding before or ancillary to—

• (1) a court or grand jury of the United States,
• (2) an agency of the United States, or
• (3) either House of Congress, a joint committee of the two Houses, or a committee or a subcommittee of either House,