re: Can a professor have a mandatory lab on fall break?

Do it. I had a professor who added an extra class period for graduate students and scheduled it for 7-9 am. When we protested, he said it was his class and could do whatever he wanted and we couldn't touch him he had tenure. He also said we would all fail, and at midterm grades he proved it, the entire class was failing. We got no credits for the extra 2 hours every week. Professors can be a bunch of dicks.