I know someone who works in a separate building than me. I do not have to work Thanksgiving night, but this person says their supervisor told them they have to work Thanksgiving night. Is that allowed? I thought working Thanksgiving (or any such holiday) was optional. Also, our part-time supervisor occasionally threatens to fire people. Sometimes I think he is only half-joking. I was always under the impression that part-time supervisors don't have the power to fire anyone. Can they fire people? Would appreciate answers.