Moral Dilemma. Don't know what to do?

I wouldn't say anything about it, although I might mention to the teacher, that groups need to be moved around, and nobody should be stuck with the same people all the time....a random number pick couldn't be lied about like birthdays...you need to get away from these people, without putting yourself in any danger, your first responsibility is to yourself. It sounds like before long their blackmail and threats might have you stealing for them....it was like that once at a job for me, they were treating us unfairly, and people came in and out of the building we cleaned at night, and one night, some people got in that looked like people were usually there but I had a bad feeling...we did not put ourselves in any danger, for one thing it is not worth it not for something material...and they turned out to be the famous robbers, been hitting up buildings...and the place lied about how many laptops they took...we knew they did not have that many lol see, even the teacher might not care, or might be a thief too, and certainly wouldn't get in the middle of a fight to protect your bod. Leave the stealing up to police work, and don't trust them either, they'll rat out who ratted out in a second, I know this by experience.