A.T.F. is a television movie produced for ABC in 1999 in which ATF agents work to infiltrate an armed militia, a group which the film describes as akin to the Branch Davidians, a religious group who were attacked by ATF agents and later killed by the FBI in Waco, Texas in the Waco Massacre of 1993.
Following the infamous tragedy in Waco, Texas, in which the Bureau of Alcohol, Tobacco and Firearms (A.T.F.) found themselves in a battle with an armed militia, the organization, led by director Maggie Hale (Kathy Baker), finds itself in a new fight. Agent Robyn O'Brien (Amy Brenneman) goes undercover to infiltrate a militia selling illegal street-sweeper guns, dismissing Hale's orders to stay away. When O'Brien gets held prisoner inside the militia's compound, the A.T.F. is left with the decision to start another Waco and attack the militia, or come up with another way to save her.