The Education Action Group says yes, on May 1. They tease us with this:

We have very serious evidence that this movement goes beyond kindergarten teachers protesting about collective bargaining. It goes far beyond the ability of public employees to negotiate over health insurance. We have evidence that there are very radical groups involved who view the union effort in Wisconsin as a beachhead in the fight against capitalism. We will offer more details May 1.

By the way, if you've seen the mobile billboard in your area, that's what it's about.