Conversation so far:
What is Axis of justice?
Axis of Justice is a political group whose declared purpose is to bring together musicians, fans of music, and grassroots political organizations to fight for social justice together.
When did Tom Morello join the Axis of Justice?
Tom Morello remarked that he formed Axis of Justice with Serj Tankian after witnessing some members of the audience at Ozzfest 2002 promoting racist symbols and imagery.

Question: Who did he work with
Self-contained rewrite: Who did Tom Morello work with in Axis of Justice?