My Boomer Dad was a Teamster. I remember there was a several-weeks-long (might have even been months-long?) strike when I was a kid, probably around the late-70s. Shit was real. One day I saw him loading baseball bats and clubs into the trunk of his Buick before he left the house. I was just a kid; I had no idea what was going on. I asked him about it later in life and he just said, "That's how it was back then. We had to fight for what we wanted." And he was being literal. He talked about people who were even suspected of crossing the line or talking to management would get a severe beatdown. He even said people would harass management and their families. Dudes would sit outside their homes, just to intimidate them. And, he said they rarely got punished because the cops supported their union and would look the other way. Different times.
our local PD was union at the time. we never got any overt support but there were a few kind gestures. on a cold morning an officer dropped a box of chemical hand warmers by the dumpster and made it very clear he was disposing of them because they were "the wrong size" and he wouldnt be back today to check on them. about three days later his supervisor made a trip to the dumpster and left out a box of donuts and a big take-out coffee jug, warning us we absolutely shouldnt consume them after he left as the donuts were the made the wrong size and the coffee was too hot.