The authoritarian UK government has ordered schools not to use any materials from organizations that advocate eliminating capitalism.

This means that schools can't teach about the history of labor organizing and the Labour Party.

Already prohibited is anything produced by an organization that "endorses illegal activity." I suppose that rules out showing people anything written by Extinction Rebellion. Although that organization is nonviolent, its protests do include violating laws in minor ways. Also anything that says you should share copies of published works, disregarding any unjust laws or anti-socializing contracts that say you can't.