Jennifer E. Gold, a lawyer in the Justice Department in Washington, and Fred L. Levy, a partner in the Washington office of the Cleveland law firm of Squire, Sanders & Dempsey, plan to marry in May. Miss Gold, 34 years old and the daughter of Dr. and Mrs. I. Roy Gold of Brooklyn, graduated from Smith College and received a law degree from Catholic University. Mr. Levy, 36 and a son of Mr. and Mrs. Melvin Levy of Brooklyn, graduated from Cornell University and the University of Southern California Law Center.