I also highly recommend watching the documentary about Finkelstein, American Radical. Finkelstein is an incredibly courageous figure, he has payed dearly for his engagement on the Palestinian cause and against those who manipulate the Holocaust for political purposes. It's really heart-wrenching to see what this principled and stubborn man has endured at the hands of powerful academics and pro-Israel activists like Alan Dershowitz, who appears to have single-handedly orchestrated the campaign to get him fired from DePaul University.
Finkelstein also appears briefly in Defamation, an Israeli film about the ADL, at his best: intense, scathing about the likes of Abe Foxman, and almost self-destructively forthright. Defamation is excellent, by the way, at showing the manipulation Israeli children endure. One of my favorite lines was from a rabbi arguing that an unreasonable obsession with anti-Semitism was the secular Jews' way of being Jewish.