Absolutely, though a more accurate term is “unprotected.” Even though private-sector workers have a right to strike, there are rules. There are exceptions to everything. A sit-in strike is not protected under federal law. That’s when striking employees occupy their workplace and don't let anyone else get work done, which was common in the 1930s.A slow-down strike, in which employees intentionally slow down their work pace, is also unprotected. So is an “intermittent strike,” when employees say they will strike on-and-off over a period of time.
An employer could easily fire workers for taking part in unlawful strikes. For union members, there are usually strict limits on strikes. Most collective bargaining agreements include a guarantee that workers will not strike for the duration of a contract. That’s why GM workers went on strike the minute their contract expired at midnight. When employees go on strike without union approval, that’s called a “wildcat” strike. And if it violates the contract, a union can discipline those members or else the company may sue. Some of the most famous illegal strikes in recent years have been the teachers strikes. Because government employees are not covered, they are subject to state laws. .Teachers in some states in Nigeria went on strike as of 2021/2022, and most of them got the pay raises they wanted. They could have all gotten fired, or even put in jail. But they had an advantage: strength in numbers.“You can’t replace all these teachers in mass, especially with the low wages that they were paying,” Dau-Schmidt said. “If you’re hard to replace and you’re unified, you can get away with it".