The Petras Act

The UN committee, coupled with the loss of its headquarters and key members, were the two death knells that signaled the end of Overwatch.[4] In the wake of such an incident, little could remain hidden. The full transgressions of Overwatch's shadow operations became known, and even the most ardent defenders inside the organization bowed to the truth and called for its dissolution. The United Nations could do nothing but shut down Overwatch.[5] The group gave into the pressure[2] and it was eventually disbanded,[1] thirty years after its founding, left in disgrace,[2] its agents now the target of derision and suspicion in the media.[4] The Petras Act deemed any Overwatch activity illegal, and liable to prosecution.[27]
sources: https://playoverwatch.com/en-us/news/20130523/
"thirty years after its founding" doesn't seem to be corroborated anywhere.

Type

Decree, Governmental

Signatories (Organizations)

• United Nations