Chitownchica has some union stories that I recall. Hopefully she'll share.
We were just talking about this very issue, me and another friend yesterday. She used to work at a big boat show up in Chicago (McCormicks, or something like that). She regaled me with stories of the union changing all of the electrical outlets in the building so nobody could plug in anything without their help. She also mentioned that one union person would bring in their 12X12 sections of carpet for their booths, but another union guy was the only one allowed to unroll the carpet. Conveniently, the unroller would almost always arrive before the thug bringing the carpet, and the carpet would not get unrolled.
My friend mentioned that many of the people at the show would never even get their stuff off of the trailers before the show ended. Yes, union thugs were also responsible for unloading.
The aforementioned boat show eventually moved to Florida. I wonder why.