TRENTON, NJ—Mordchai Fish, the principal rabbi of Congregation Sheves Achim in Brooklyn, N.Y., admitted today to conspiring to launder approximately $900,000 he believed was criminal proceeds, U.S. Attorney Paul J. Fishman announced. Fish, 58, of Brooklyn, N.Y., pleaded guilty before U.S. District Judge Joel A. Pisano to an Information charging him with money laundering conspiracy. According to documents filed in this case and statements made in Trenton federal court: Fish admitted that beginning in early 2008, he met with Solomon Dwek, an individual he now knows was a cooperating witness with the United States. For a fee of approximately 10 percent, Fish agreed to launder and conceal Dwek's funds through a series of purported charities, also known as "gemachs," which Fish controlled or to which he had access. Fish admitted that prior to laundering Dwek's funds, Dwek repeatedly told him the money was the proceeds of illegal activity—including bank fraud, traffic...