Mgt doesn't do it - this is very smart because it eliminates the direct supervisory level which is very oppressive. The best way to get resistance is to have a person supervising. If low, people will just walk. Cant be favourable for both. If IR law undermines or weakens unions, this increases managerial power.
People work because they have to due to capitalism and individualism.
The company owns the jobs. The worker has no right to their job. Another form of discipline is that we're pre-socialised to work.