They were on private property and had been told to leave, but stayed and were filming printed materials not legible from the public sidewalk.
Majority of workers are non union and think unions have served their purpose. This kind of behavior just re enforces their beliefs. Mindless liberals like you think scum bag union members have a right to perpetrate violence. You are some kind of stupid if you think so. Oh, and don't tell me that these fanatics do not do the same thing on public property. You Fail.