The Commission to Investigate Alleged Police Corruption (known informally as the Knapp Commission) became informed of Frank Serpico's police corruption by him doing what?
Knapp Commission: The Commission to Investigate Alleged Police Corruption (known informally as the Knapp Commission, after its chairman Whitman Knapp) was a five-member panel initially formed in April 1970 by Mayor John V. Lindsay to investigate corruption within the New York City Police Department. Frank Serpico:  He is known for whistleblowing on police corruption in the late 1960s and early 1970s, an act that prompted Mayor John V. Lindsay to appoint the landmark Knapp Commission to investigate the NYPD.
whistleblowing