Fair enough, I have not and was going on hearsay, but from wikipedia "As time passed however, scholarly reviews became more critical, chiding Carnegie for being insincere and manipulative" (https://en.wikipedia.org/wiki/How_to_Win_Friends_and_Influen...)
And it also says "Charles Manson used what he learned from the book in prison to manipulate women into killing on his behalf" but I don't know if that can be blamed on the book.
And it also says "Charles Manson used what he learned from the book in prison to manipulate women into killing on his behalf" but I don't know if that can be blamed on the book.