Because of this assumption, members of both movements go in big for conspiracy theories. The ’60s left developed elaborate theories of how world history was being manipulated by shadowy corporatist/imperialist networks — theories that live on in the works of Noam Chomsky. In its short life, the Tea Party movement has developed a dizzying array of conspiracy theories involving the Fed, the F.B.I., the big banks and corporations and black helicopters.