First of all, do you know the difference between Socialism, Marxism, Anarchism and Communism? If not, you can start by checking out this quick run-down (disclaimer: this video is made by a Marxist).

Now, what OOP is saying is that we know from historical evidence that state socialism (like Marxism) always ends badly, one way or the other, but we also know that anarchism and libertarian socialism do work, so we need to push for that without falling in the pitfall of believing that ‘this time state socialism might work’.