On October 18, 1971, hearings began before the Knapp Commission in New York City.
What were the Knapp Commission hearings, you might ask? I'm so glad you did! I just published a whole article about them at The Progressive.
Basically, the Knapp Commission was formed in 1970 after police officers Frank Serpico and David Durk tried for years to get anybody in the New York Police Department (NYPD) to pay attention to the fact that the majority of its police officers were accepting pay-offs to look the other way on gambling, prostitution, theft, and a bunch of other crimes. The Commission helped bring national attention to the massive problem of police corruption. It focused specifically on the NYPD, but if you read its report, you'll find that a lot of what it suggests as problems and possible solutions would still hold up and provide helpful guidelines for any institution that wants to be less corrupt.
Assuming, that is, any of our remaining American institutions have any interest in not being corrupt.
There's a lot of good nonfiction out there to read about this event and time in history: consider starting with Peter Maas's bestseller Serpico (which, nearly fifty years after it was first published, is still a spectacular read). If you're interested in what all goes on when a "commission" and "hearings" are formed to investigate problems, you might also want to read Michael Armstrong's history: They Wished They Were Honest: The Knapp Commission and New York City Police Corruption. It's a very personal history; Armstrong served as the lead counsel during the Commission hearings.