Under his leadership, the black nationalist and separatist sect (then called the Nation of Islam) expanded, mainly among poor blacks and prison populations.
Although the group numbered only about 8,000 when Muhammad took over, it grew rapidly in the 1950s and 60s, particularly as a result of the preaching of one of its ministers, Malcolm X.
Tension between Muhammad and Malcolm developed, however, and Malcolm's subsequent suspension (1963) and assassination (1965), possibly by Muhammad's followers, caused great dissension in the movement.
When Muhammad died in 1975, his son, Wallace D. Muhammad (later Warith Deen Mohammed) took over, preaching a far less inflammatory version of Islam. He aligned the organization with the international Islamic community, moving toward Sunni Islamic practice, and opened the group (renamed the World Community of Islam in the West and later the American Society of Muslims) to individuals of all races.
In 1977 a group of Black Muslims, led by Louis Farrakhan, split off from the organization, disillusioned by the son's integrationist ideals and lack of allegiance to his father's brand of Islam. They named themselves the Nation of Islam and sought to follow in the footsteps of Elijah Muhammad. In the late 1990s the Nation of Islam began to embrace some traditional Islamic practices, and Farrakhan and Muhammad publicly declared an end to the rivalry between their groups in 2000. W. Deen Mohammed resigned as head of the American Society of Muslims in 2003.
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http://www.freerepublic.com/focus/f-news/1416712/posts