Conversation so far:
What was Abbie Hoffman's Chicago Eight conspiracy trial about?
Abbie Hoffman was arrested and tried for conspiracy and inciting to riot as a result of his role in anti-Vietnam War protests.
Where any other beings tried with Abbie Hoffman in the Chicago Eight trial?
Abbie Hoffman was among the group that came to be known as the Chicago Seven (originally Chicago Eight), which included fellow Yippie Jerry Rubin, David Dellinger, and Rennie Davis.
And who else was tried with Abbie Hoffman in the Chicago Eight trial?
Others included John Froines, Lee Weiner, future California state senator Tom Hayden and Black Panther Party co-founder Bobby Seale.

Question: What happened that they became known as the Chicago Seven rather than Eight?
Self-contained rewrite: What happened with Abbie Hoffman and others that they became known as the Chicago Seven rather than Eight?