The rapper told reporters that he joined the group because he was "doing what's right and representing what's right," according to a report published Monday on the network's Web site.
Wearing sunglasses, a dark suit and a tie, Snoop spoke briefly in front of a crowd of thousands Sunday and praised the Chicago-based movement's Minister Louis Farrakhan.
Farrakhan has long held relationships with famous rappers and hip-hop artists. Snoop, whose real name is Calvin Broadus, called himself the leader of the "hip-hop community" and says he'll always seek out the minister.
Snoop gave a $1,000 donation to the Nation of Islam, then sat on stage and smiled and nodded as Farrakhan delivered a speech.
Snoopp later told reporters that Farrakhan's speech was "about a mirror — it's about looking at yourself," the BBC reports.
"We're doing a lot of wrongs among ourselves that need correcting," he told the network.
Rapper T.I., whose real name is Clifford Harris, appeared via recorded video. He told followers that education is the key to success.
The Associated Press contributed to this report.