Anti-Flag was an American punk rock band formed in Pittsburgh, Pennsylvania, in 1988. The band was known for its left-wing political activism. For the majority of the band's career, their members included Justin Sane, Chris Head (guitar), Pat Thetic (drums), and Chris Barker, also known as Chris No. 2.

Justin Cathal Geever, known professionally as Justin Sane, is an American singer and guitarist. He was the lead guitarist, singer and songwriter of Anti-Flag, a punk rock band formed in 1988 in Pittsburgh, Pennsylvania that was known for its left-wing political views. Sane holds US and Irish citizenship and lived in Pittsburgh.