Ayatollah Hussein Ali Montazeri (b. 1922, d. 2009 in Qom, Iran) is an Iranian scholar, theologian, writer, human rights activist, and a Shiite Grand Marja (religious authority). He was one of the leaders of the Iranian Revolution in 1979. He is best known as the one-time designated successor to the revolution's Supreme Leader Ayatollah Khomeini who fell out with Khomeini in 1989 over government policies that Montazeri claimed infringed on freedom and denied people's rights. See http://islamopediaonline.org/node/1331 and http://islamopediaonline.org/node/1377.