That's basically what I mean. They can start by excommunicating, which would be a powerful statement at least to their own people. But they can also take whatever information they have to the relevant law enforcement body with jurisdiction to do something about it. Just because they're not the cops in most places in the world doesn't mean there aren't cops who could investigate and prosecute if it's warranted, and it doesn't mean that the thing they can do is useless or meaningless.