[jmakov]

Can I prove that I'm a part of an org and use this as SSO?

[k__]

Yes, but in that specific example you could also simply use a signature, as the fact that you are part of a single org reveals all information.

If you were part of multiple orgs and just want to prove you're part of any of them without revealing which in particular, then a ZKP can help.

[TimJRobinson]

Yea you can prove you're some set of users without revealing which one.

This is useful in the case of whistle blowing you can prove you do work at a company, or say a US Senator can show the government is up to no good and prove they are a senator without revealing who they are.