Top Russian Scientists Lured to the U.S.

But the rush to exploit a previously untapped source of talent has not been without problems

Minneapolis, Minnesota -- Marvin L. Marshak had a problem -- an enviable one, perhaps, for a university administrator. As head of the School of Physics and Astronomy at the University of Minnesota here, he was given a $2-million endowment, with which he planned to create a theoretical-physics institute.

But when he tried for two years to hire the institute's first "superstar" -- a top-notch theorist who could attract other leading researchers to the faculty -- all of his American