For a rebbe to strike for BACKPAY OWED, Rav Moshe has already paskened NO.
For a rebbe to strike about a PAY CUT, certainly NO. There are ten capable people to take over any desk vacated by ANY rebbe. If the rebbe feels his s’char betailah is worth more than his salary, kol hakavod, QUIT and try out the REAL job market.
Strikes and Unions are NOT the way Rebbeim should be acting. If this is their mentality, they should be in another profession.