Leon Trotsky said this quote
“ The principles of liberalism can have a real existence only in conjunction with a police system. Anarchism is an attempt to cleanse liberalism of the police. But just as pure oxygen is impossible to breathe, so liberalism without the police principle means the death of society. Being a shadow-caricature of liberalism, anarchism as a whole has shared its fate. Having killed liberalism, the development of class contradictions has also killed anarchism. Like every sect which founds its teaching not upon the actual development of human society, but upon the reduction to absurdity of one of its features, anarchism explodes like a soap bubble at that moment when the social contradictions arrive at the point of war or revolution. ”