Regarding union strikes, I personally don’t get why sanitation workers don’t strike to get a lot more money, they certainly deserve it.
Mostly caused by a lack of radical leadership. You tend to find the unions getting shit done have reds running them, often from groups like the IWW or other entryist parties or salters (Chris Smalls amazon union are leninists and it took an absolutely massive salting effort to achieve), doing work in this space is extremely difficult because entrenched liberals are do-nothings and shifting them out of leaderships is not simple as reaching workers and convincing them that the leadership is trash is a lot of long and very hard effort that often requires salting the workplace as well.
So tldr it’s about getting the people that want to stir shit up into those leadership positions and those people aren’t liberals.