The Nation of Islam, abbreviated as NOI, is an African American political and religious movement, founded in Detroit, Michigan, United States, by Wallace D. Fard Muhammad on July 4, 1930. Its stated goals are to improve the spiritual, mental, social, and economic condition of African Americans in the United States and all of humanity. Critics have described the organization as being black supremacist and antisemitic. The Southern Poverty Law Center tracks the NOI as a hate group. Its official newspaper is "The Final Call". In 2007, the core membership was estimated to be between 20,000 and 50,000. 

After Fard disappeared in June 1934, the Nation of Islam was led by Elijah Muhammad, who established places of worship (called Temples or Mosques), a school named Muhammad University of Islam, farms, and real estate holdings in the United States and abroad. The Nation has long been a strong advocate of African-American businesses. 

There were a number of splits and splinter groups during Elijah Muhammad's leadership, most notably the departure of senior leader Malcolm X to become a Sunni Muslim. After Elijah Muhammad's death in 1975, his son, Warith Deen Mohammed, changed the name of the organization to "World Community of Islam in the West" (and twice more after that), and attempted to convert it to a mainstream Sunni Muslim ideology.
How do those critical of it describe it?
Critics have described the organization as being black supremacist and antisemitic.