I'm guessing they learned this form of "Greeting" from the Westboro Baptist Thugs

Union Visits Private Home To Intimidate: Local Media Calls It Caroling. “Are you kidding me? A caravan of 80 people to sing insults and, according to eyewitnesses, shouting ‘F*CK YOU’ at various houses right before Christmas? This isn’t ‘caroling,’ this is intimidation.”

Have pro-lifers do the same thing at Planned Parenthood folks’ homes, and see how they cover that. Just remember, the political pitchfork is turning, people are paying attention, the media don’t control the narrative any more, and all this stuff is precedent . . . .

Here's the story as it is told by the local TV station. Pretty mellow. They get a lot of $$ from the union.

THUGS, that's what they are. If this is union, I'm anti union!