One contributor is the fact that law enforcement rarely strikes but used their FOP and “union” organizations to slow, or sandbag work as a negotiation tactic. With membership that is largely unaccountable the blue wall is a political tool to leverage public funds by threat of crime and alternatively allowing or shutting down private unionization efforts.

https://www.newyorker.com/news/news-desk/how-police-union-po...

https://www.nytimes.com/2020/06/06/us/police-unions-minneapo...

https://www.opensecrets.org/news/2022/06/police-unions-spend...

https://www.ojp.gov/ncjrs/virtual-library/abstracts/historic...