I had a teacher who censored books in high school.
The class was AP English III, my junior year. The school district allowed the teachers to assign their own books, but the students had to pay for them. Not that big of a deal. One of our books was "A Prayer for Owen Meany" by John Irving (you may remember that they tried to make it into a movie, but it was so horrid that john irving refused to let them put his name on it. the movie was then renamed "simon birch"). When we got the books, we discovered that she had redacted a full chapter of the book with black sharpie and stapled all the pages together.

Well, being one that aligns myself with free speech, the fact that the class that I was in a class that was earning me college credit, and the fact that I PAID for the god damn book, I went on a crusade.

Phase I: I was a senior editorial writer for the school newspaper. We had a top notch newspaper that wasnt only distributed at my high school, but was also carried in probably 20 local businesses around town. I wrote an editorial crucifying her. It got rave reviews and boosted my popularity at school about 4000% because I just bashed the crap out of a teacher.

Phase II: I went before the school board and informed them of the situation. I provided them evidence of the damage to the books, I provided them the receipt for my payment of the book. I provided them with another copy of the book to see what had been redacted. It was a passage of the book that disagreed with the teacher's religious beliefs and she felt it was "inappropriate" to be taught in schools. I explained that kids taking collegiate courses deserve to be treated at collegiate students, that being mature enough to make their own decisions as to what is and what isnt appropriate, especially where books they had purchased themselves were concerned. They agreed and action was taken to correct the problem, both on the teacher's part, but also reimbursing every student in the class for the cost of the book.

I dont deal with censorship well, especially if the books in question are being taught to students old enough to know the difference.