The scheme’s mastermind, prosecutors said, was Mr. Cabasso, the 61-year-old owner of Aventura and a resident of Northport. In a memo seeking to detain Mr. Cabasso in custody until trial, prosecutors portrayed him as a serial con man with a long criminal history. Since 1982, prosecutors said, he had been convicted of jury tampering, grand larceny and other crimes. He had deep business relationships in China and used a network of shell companies to launder the millions of dollars he made, the prosecution memo said. Mr. Cabasso was also accused of making false representations that his wife was Aventura’s chief executive so that the company could obtain government contracts set aside specifically for small businesses owned by women.