Few academic economists, since almost all of them are Keynesians of some sort, will teach Hayek.
Marx's theory (Marxism) is essentially a theory on collectivism and the one everybody with a pulse knows by name. Yes, collectivism as a theory existed before Marx, but his theories on it were what birthed most of what came after him.
They're not really successful, which is my argument. Their supporters find ways to make it sound that way, but they're really not. The NHS has a new controversy every damn month at this point of them doing something "Holy balls!" terrible.
The simple truth that people will care for something better if owned individually than owned collectively is why collectivism fails.