The Amalgamated Transit Union in Las Vegas struck in the late 90's or early 2000's. But the union drivers were so rude to passengers and so inefficient that, when Citizens Area Transit hired replacement drivers who turned out to be much kinder and better at their jobs, the public response compelled CAT to just hire the replacements full time and tell ATU 587 to stick it. No one really cried over that one, which is something given Vegas is a pretty big Union town.
The replacements did eventually join the ATU in some capacity and things have been fine since. But it's a prime example of a union vastly overestimating their leverage and the other side finding them very easily replaceable... to the point of the replacement being an upgrade.