This book is about a moral panic resulting in the deployment of huge police and bureaucratic resources to ruin the lives of some unlucky individuals who were, or seemed to be, Communist Party members or sympathisers. None of Deery’s cases seems to have been doing anything that posed an actual threat to the US government or population; that, at least, is how it looks in retrospect. But at the time the House Un-American Activities Committee (HUAC) and the FBI judged otherwise and saw them as dangerous anti-democratic conspirators pledged to undermine, if not overthrow, the state. (Does any of this sound familiar?)