NYC has some of the strongest unions in the country. Everything from hotels to the MTA are plagued by really, really strong unions that only care about their interests -- leaving the city with a shameful transit system, in this case.
Unions make up nearly 25% of workers in NYC[2], that's more than the double the national average. The corruption is rampant[3] and the city is literally powerless against them[4].
[1] https://news.ycombinator.com/item?id=14948921
[2] http://www.crainsnewyork.com/article/20170910/BLOGS01/170909...
[3] https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-...
[4] https://www.nytimes.com/2018/02/16/nyregion/carpenters-nyc-u...