However, he has become a victim of ostracism by the politically correct left. Why? Because he is pro-life. His opposition to abortion and the subsequent ostracism he experienced has led him to speak out against other aspects of political correctness, such as campus speech codes. He wrote a book Free Speech for Me - But Not For Thee on the subject, and in recent years has become critical of the American Civil Liberties Union over these issues. Hentoff has previously served on the Board of Directors of the New York Civil Liberties Union.