Daniel Flynn (Intellectual Morons, Why the Left Hates America) pulls no punches in his survey of left-wing schemes, personalities, agendas, and movements. In spite of a clearly stated bias, he manages to inform and elucidate, even as he dredges up singular and worst-case examples of progressivism. The Nation review explains:

…His book is, nonetheless, one worth taking seriously. Unlike his fellow partisans, Flynn has spent some time in libraries and archives, and he strains to turn this erudition into a larger interpretation of the phenomenon he detests. On the whole, however, his book is an intriguing failure…one that reveals a certain bewilderment among conservative activists at the persistence of their enemies’ influence.