Between the 1880s and 1920s, a broad coalition of American dissidents, which included rabble-rousing cartoonists, civil liberties lawyers, socialist detectives, union organizers, and revolutionary martyrs, forged a culture of popular radicalism that directly challenged an emergent corporate capitalism. Monopoly capitalists and their allies in government responded by expanding conspiracy laws and promoting conspiracy theories in an effort to destroy this anti-capitalist movement. The result...