Anti-Flag is an American punk rock band from Pittsburgh, Pennsylvania, United States.The band is well known for politically charged lyrics and activism, focusing on anti-war activism, anti-imperialism, class struggle, human rights, and various sociopolitical sentiments.The line-up includes singer/guitarist Justin Sane and drummer Pat Thetic, who founded the band; later members are guitarist Chris Head, and singer/bassist Chris Barker (#2) who replaced Jamie "Cock" Towns, who had replaced original bassist Andy Flag in 1997 following his departure one year prior.Anti-Flag is known also for their advocacy of progressive political action groups such as Greenpeace and Amnesty International.Most recently, the band has declared solidarity with the global Occupy Together movement.