Who supported them? Communists.
You think I'm being extreme here? At the top of that link I clicked on the About Us page, where I read this:
Read SocialistWorker.org's "Where We Stand" for a brief statement of the tradition we stand in and our political positions.
What do we find on the Where We Stand page?
We stand in the Marxist tradition, founded by Karl Marx and Frederick Engels, and continued by V.I. Lenin, Rosa Luxemburg and Leon Trotsky.
Oftentimes we're judged by the company we keep. That being true, Shame on you, Los Angeles teachers.
I've written about teachers unions' links to communist groups before. It concerns me greatly.