Islamic socialism is a huge thing. Why do you think the US backed the Shah in Iran? Who was the Shah imprisoning?

The Koran absolutely forbids charging interest (which is why there is an entire alternate Islamic banking system) and one of the five pillars of Islam is zakat - giving money to the needy. Shariah explicitly demands forms of land redistribution and mandates zakat.

If you read Qutb (literally wrote a book called Social Justice in Islam), you realize that there’s actually a substantial group of people who are very heavily inspired by Marx and Lenin, and also believe that apostates should be killed.