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 (vocals, bass), who is also known as Chris No. 2. 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 their advocacy of progressive political movements such as Greenpeace, Amnesty International, and the Occupy movement.