Is this a Group Boycott?

The Sherman Antitrust Act prohibits combinations, contacts, and conspiracies in restraint of trade.  What if a trade association says its members will not deal with service providers unless the service providers contribute $2,500 each to defeat a candidate for governor?  Doesn’t this sound like a group boycott?

In this case the trade association is the California Applicants Attorneys Association (workers comp attorneys), the Service Providers are California physicians, and the Candidate for Governor is Arnold.

It sounds like the workers comp attorneys are putting their special interests ahead of their injured clients.  Say it isn’t so! Where is the California Attorney General on this?

via James Hamilton at Econbrowser.