"Uh-huh," the union member says, nodding.

"Did you guys get fined if you weren't there?" the cameraman asks.

"Yeah," the union member replies.

"How much did you get fined?" the cameraman asks.

"A hundred and fifty," the man says, although he later adds, "It's two-fifty if you don't go." Watch the video below:

This isn't the first instance in a Massachusetts Senate race where unions have been accused of generating fake grassroots support for the Democrat.

In 2010, before Brown's victory in the special election, a union member wearing a shirt supporting the Democratic candidate, Martha Coakley,  told a local blogger on camera that he had been paid $50 to wear the shirt but that he was actually voting for Brown.