WASHINGTON — The Treasury Department’s top law enforcement official has left the agency to become a partner in the litigation practice of the law firm Morrison & Foerster.

Treasury Under Secretary for Enforcement James E. Johnson, whose responsibilities included oversight of the U.S. Customs Service, the U.S. Secret Service, and the Bureau of Alcohol, Tobacco, and Firearms, said he will to join the firm’s New York office Feb. 5.

In a news release Wednesday, Mr. Johnson said he liked the firm’s reputation for taking on “some of the most complex, sophisticated, and intellectually challenging cases, both domestic and international.”

Mr. Johnson was one of the agency’s principal officials in charge of combating money laundering. Before joining the Treasury Department in 1996 he spent six years in the U.S. Attorney’s Office for the Southern District of New York.

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