By Martin Vaughan Of DOW JONES NEWSWIRES WASHINGTON (Dow Jones)--U.S. prosecutors Thursday filed the first criminal charges against a U.S. client of UBS AG's (UBS) Swiss banking services, in the wide-ranging tax-evasion probe involving the bank. Steven Michael Rubinstein, of Boca Raton, Fla., was charged with filing a false income-tax return and detained in Fort Lauderdale, Fla., pending an April 7 bond hearing. "We expect that this prosecution is just the first of the prosecutions that will be brought, as we continue to review the information we have received from all sources," said acting Assistant Attorney General John A. DiCicco of the Justice Department's Tax Division in a press release. The U.S. government alleges that Rubinstein was the beneficial owner of UBS accounts in the name of Hybridge International Ltd., a British Virgin Islands corporation. From 2001 through 2008, Rubinstein communicated with UBS bankers regarding the account, the government alleged, directing the purchase and sale of securities worth 4.5 million Swiss francs - about $4 million at current exchange rates. Rubinstein repatriated about $3 million in the U.S. to purchase property and construct a home in Boca Raton, the U.S. charged. Rubinstein did not disclose the existence of the UBS account, as required by law, on his 2007 income tax return, nor did he report income from the account on the return, the Justice Department said. According to the Justice Department release, Rubinstein is a chartered accountant who works for an international company that helps clients to build, buy and sell yachts. -By Martin Vaughan, Dow Jones Newswires; 202-862-9244; martin.vaughan@dowjones