The Communist Manifesto (Marx)
Mein Kampf (Hitler)
Quotations of Chairman Mao
The Kinsey Report on Sexual Behaviour in the Human Male: to be fair, they complain that Kinsey was insufficiently cautious about adult sexualisation of children, which I think is fair criticism
Democracy and education (Dewey): that they find this book harmful tells you everything you need to know about the conservative mind set. Their review of this book complains that Dewey 'disparaged schooling that focused on ... hard knowledge, and encouraged the teaching of thinking skills instead'. OMG not thinking skills!
Das Kapital (Marx)
The Feminine Mystique (Friedan): get back in the kitchen, harlot
The Course of Positive Philosophy (August Comte): atheism
Beyond Good and Evil (Nietzche): oh, please
General Theory of Employment, Interest and Money (Keynes): they should read this, they might learn something
They list some other 'dangerous' books which include
The Authoritarian Personality (Theodor Adorno)
On Liberty (John Stuart Mill)
Origin of the Species (Charles Darwin)
Madness and Civilization (Michel Foucault)
The Second Sex (Simone de Beauvoir)
Coming of Age in Samoa (Margaret Mead)
Silent Spring (Rachel Carson)
Introduction to psychoanalysis (Freud)
Can you imagine being that frightened, that insecure, that you think these books are harmful?