as well as the strike there is the boycott. (if you're individuals, it's called a "boycott"; if you're a state, it's called "economic sanctions")

cf https://news.ycombinator.com/item?id=23414101

(but note that Dr. King was permanently cancelled the day after delivering that speech)

Edit: replacement link for the rotted one: https://www.afscme.org/about/history/mlk/mountaintop