A fourth individual was being sought Saturday in the wake of search-warrant executions at 17 businesses tied to the alleged ring.
The operation targeted stores in the greater Los Angeles area that allegedly sold nitrous oxide to drug abusers. Racing enthusiasts use the gas to increase speeds, the Los Angeles Times said Saturday.
"We want the public, especially parents, to be aware of its abuse by our youth," Los Angeles U.S. Atty. Andreé Birotte said in a written statement.
The Times said the 15-month investigation was a response to a spike in traffic accidents involving juveniles under the influence of the gas.