Several years ago, long story as short as possible, the head band director of a local school got himself into a bit of trouble. He himself didn't do anything wrong but by a technical violation of the rules/law he may not have reported what he should have reported. I don't think he was charged, but he was "encouraged" to resign.
When everything hit the fan, he found out he had more support than he realized, including from the band students, parents, and a large part of the community. Unfortunately, only the school board itself could rescind a resignation and while a friend of mine on the board did the right thing and made a motion to rescind the resignation, no one seconded it, and the motion died. The resignation stood and to this day, the director has been out of education.
This all happened at the end of the school year. A good friend's daughter was to be the incoming band President and they wondered what could be done. I was asked my opinion and so we met. I asked the girl, "how far are you willing to take this?" Her idea was a petition or something like that. I told her she was wasting her time. They'd wad that up and throw it in the trash wondering why they ever taught students to write.
I told her the only way anything would POSSIBLY be accomplished was to get everyone in band together and quit. Including, if possible, the incoming band students from junior high. It would have to be a joint effort with the students and parents. They'd have to make their demands to the administration. There was no way the high school could risk going to football games or UIL marching contest without a band, or with a 10-piece band, so if they all stuck together, MAYBE something could be done. They were, of course, under no obligation to sign up and be in band and the school had no way to get 150+ people trained to play instruments in 3 months time.
I cautioned her that the administration could and probably would dig there heels in, thinking the students would value band over the protest and think the students would eventually give in. I said there's no guarantee and you have to be prepared to miss your senior year of band and not be band President. In the end, they decided not to go that route.
The bottom line: if you take a stand it WILL cost you something -- maybe something you value highly. You have to be prepared for that. Most protestors either don't know that, think its just, or are unprepared for it.