Conspiracy theories are just as batshit whether they're socialist or fascist. The only difference between yours and the nazi type is that the nazis added the adjective "jewish" to their description of "capital"... but I guess these days the left is doing that too!
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.