Anti-Flag is an American punk rock band from Pittsburgh, Pennsylvania. The band is known for its left-wing political activism. Their current members include Justin Sane (vocals, guitar), Chris Head (guitar), Pat Thetic (drums), and Chris Barker or Chris No. 2 (vocals, bass). The band was originally formed by Justin Sane and Pat Thetic in 1988. Notable past members include the bassists Jamie "Cock" Towns and Andy Flag. Anti-Flag is also known for its advocacy of progressive political movements such as Greenpeace, Amnesty International, and the Occupy movement.