Frank W. Ricci is a marvel at promoting his law practice. The North Palm Beach immigration attorney, who has a bachelor’s degree in marketing, attracts clients from across the globe with his international seminars on “How to Invest in a U.S. Business and Get the Green Card.” He advertises in publications as disparate as the Pennysaver and the Economist and, as a gimmick, hands out green-colored business cards to prospective clients in search of permanent residency in the United States.

Now, at least two of those clients are accusing Ricci of stealing hundreds of thousands of dollars from them, money they claim the lawyer should have invested for them in U.S. businesses in order to obtain a particularly expensive visa designed to attract rich foreigners.