The writings of Karl Marx— especially The Communist Manifesto— had the longest lasting effect on me as a young man and led me to become and remain a Marxist throughout my twenties. I wouldn't recommend The Communist Manifesto today either, except as an example of a masterpiece of propaganda.
There was no book that changed my mind about being on the political left. Life experience did that— especially the experience of seeing government at work from the inside.
— Thomas Sowell; Dismantling America