It seems clear that Marcy has been "condemned by a government-like body" (with or without due process -- I don't know). At any rate, this isn't simple freedom of association.

And according to the article, the blacklist doesn't only affect Marcy, it affects people who continue to work with him. I would say that's going too far.

Finally, I'm not sure what we gain by systematically excluding Marcy from astronomy research. Maybe a 5 year ban would be enough or perhaps we could go with a restorative justice approach here.