There’s no conspiracy theory. Jimmy Carter spent the last decade of his life talking about this. Bernie Sanders talks about this all the time. Noam Chomsky talks about this. Ralph Nader was talking about this forever.

Go listen to Ian Shapiro’s Yale lectures called Power and Politics in Today’s World. It’s an amazing lecture series and you’ll learn a lot.

Though I’m surprised you think it’s surprising left leaning people would criticize the role of capital in politics, since that’s kind of the whole thing with true leftists.