A Long Island man was convicted in Manhattan federal court on Thursday of a racketeering conspiracy and other charges in a case prosecutors in Manhattan once described as the largest no-fault auto insurance fraud ever.

Mikhail Zemlyansky, 37, of Hewlett, was also convicted of securities fraud charges in a scheme to cheat investors in two so-called settlement-claims companies that said they were raising money to fund lawsuits.

Prosecutors in 2012 alleged Zemlyansky was a leader in a fraud ring that recruited auto accident victims to go to bogus medical clinics it controlled and get unnecessary treatments to collect $50,000 in no-fault medical coverage available in New York.

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In an earlier trial, jurors could not agree on a verdict on that charge. Zemlyansky was immediately detained by U.S. District Judge Paul Oetken after the verdict on Thursday. His maximum prison time could exceed 100 years, officials said.

Defense lawyer Ron Fischetti said he intended to appeal.