There are also many smaller orgs that do good work and are commie but they're regional or city-specific.

A good question to ask when shopping for an org is to ask who is organizing? Not just attending an action, but doing real world organizing. Focus on those groups in your area.

Also make sure that you're comfortable leaving or disagreeing with your org at all times. If something goes south, you want the option of supporting the right side. The stuff with PSL you mention is what happens when comrades make bad decisions in an attempt to save face and protect each other and would've been avoided if the chapters in question had discipline.