Obscenity Prosecution Task Force
The Obscenity Prosecution Task Force (OPTF) was an organization created in 2005 by the United States Department of Justice. The OPTF's job was to investigate and prosecute producers and distributors of hardcore pornography that meets the legal tests for obscenity, as defined by the Supreme Court of the United States.
Source: Wikipedia — Obscenity Prosecution Task Force (CC BY-SA 4.0)