Conversation so far:
What was Hardcore 81?
On April 22, 1981 the band released their second album Hardcore '81.
who was fired from the band?
Randy Rampage was fired from the band on January 1, 1982.
Who replaced him?
replaced by ex-Skulls drummer Dimwit on bass.

Question: who left the band to work for Black Flag?
Self-contained rewrite: Who left the D.O.A band to work for Black Flag?