The Circle Jerks were an influential punk rock band formed in Los Angeles in 1979. Notably comprised of former Black Flag vocalist Keith Morris and Redd Kross guitarist Greg Hetson, the band was known for their fast, aggressive style, a hallmark of the early hardcore punk scene. They were instrumental in the development of hardcore punk, with their debut album, "Group Sex," widely regarded as a seminal work in the genre. Despite numerous lineup changes and hiatuses, the Circle Jerks' impact on punk music and culture remains significant.