For anyone interested, here is some more context for this quote : https://www.marxists.org/reference/archive/stalin/works/1936/03/01.htm#:~:text=Real liberty can exist only,of home and of bread.

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Uniforms in school don’t wipe distinctions, they make them less visible to outsiders, every kid still knows who is rich, who is poor, who is religious and who is not. Uniforms serve as a security theater, and limit considerably the freedom of every child who wears one while augmenting the parents expectations of how safe a place the school is.