What did Congress use to investigate the government Armed Forces unions education science newspapers and other aspects of all of American Life?

Congress used various investigative committees and hearings to scrutinize different aspects of American life, including the government, Armed Forces, unions, education, science, and the media. Key examples include the House Un-American Activities Committee (HUAC) and the Senate Permanent Subcommittee on Investigations, which conducted inquiries into alleged communist influences and corruption. These investigations often involved testimony from witnesses, extensive documentation, and public hearings to examine and expose issues affecting the nation.