The good folks at Circle One Central report: "(It's) just your standard symbol for revolution and it originated from some anarchist movement. We think it represents underground unity. Our original bass player Mike Ituarte designed it in 1980. He modified it a bit. I believe it was Turkish." Lead singer John Stephen Macias (January 29, 1962 - May 30, 1991) was by all accounts a deeply scary guy (also, conversely, a staunch Christian) and was shot dead after a confrontation with Santa Monica police after knocking a security guard off the Santa Monica Pier when told to stop preaching the word of the Lord. Purportedly Macias walked into a hail of bullets and just kept going - and so have Circle One, actually.
The logo's from Turkey. It's the best I could come up with for Thanksgiving Day. If you know which anarchist faction from whence this logo originally sprang, we'd like to know!