The conversion of Malik el-Shabazz (better known as Malcolm X) in 1964 is widely regarded as the turning point for the spread of orthodox Sunni Islam among Black American Muslims. Encouraged to learn about Sunni Islam after his departure from the Nation of Islam, he converted; others from the Nation of Islam soon followed.[citation needed] Warith Deen Mohammed rose to leadership of the Nation of Islam in 1975 following the death of his father Elijah Muhammad and began the groundbreaking, though sometimes controversial, process of leading Black Muslims out of the NOI and into Sunni Islam. As a result of his personal thinking and studies of the Quran, he became part of Ahlus Sunnah during a term in federal prison from 1961-1963 for refusing induction into the United States military.[citation needed]