Socialism cannot function without imposing Slavery on its subjects.
It must to be able to control people, institutions and businesses from the top.
This control may be benign at first but as conditions inevitably break down the control will become more and more severe.
Rights and privileges may be given up in exchange for favor. The favors will eventually disappear. When that happens the people will realize they are Slaves.
Socialism will end up as Communism.
Except for the ruling class, SocialismSlavery is the condition of all the people in a Socialist or Communist regime.