The Organized Crime Control Act of 1970 (Pub.L. 91-452, 84 Stat. 922 October 15, 1970), was an Act of Congress signed into law by U.S. President Richard Nixon. It prohibits the creation or management of a gambling organization involving 5 or more people if it has been in business more than 30 days or accumulates $2000 in gross revenue in a single day. It also gave grand juries new powers, permitted detention of unmanageable witnesses, and gave the attorney general authorization to protect witnesses, both state and federal, and their families. This last measure helped lead to the creation of WITSEC, an acronym for witness security.

Part of the Act created the Racketeer Influenced and Corrupt Organizations Act.