 Feldman is the founder of the Association for Civil Rights in Israel (ACRI) as well as a founding member of B'Tselem.Among his other cases, he acted as the advocate in a joint petition to the Israeli High Court of Justice by Director Mohammed Bakri and Indymedia Israel over the censorship of Bakri's film "Jenin, Jenin".The Mordechai Vanunu case is the case of a former Israeli nuclear technical assistant who revealed details of Israel's nuclear weapons program to the British press in 1986.