[BBC] The 30-year-old artist, whose real name is Willie Junior Maxwell II, was arrested on Thursday at a stadium in New York City ahead of his concert.Mr Maxwell and five other people are accused of transporting drugs, including heroin, on Long Island and New Jersey.
If convicted they face a maximum of life imprisonment.
Mr Maxwell has so far made no public comments on the issue.
"As alleged, the defendants transported, distributed and sold more than 100 kilograms [220lb] of deadly and addictive drugs, including heroin and fentanyl, on Long Island, deliberately contributing to the opioid epidemic that has devastated our communities and taken too many lives," US Attorney Breon Peace was quoted as saying by CNN.