The University of Massachusetts Foundation has told its money managers to divest its $530,000 of holdings in companies that do business with Sudan, in an effort to put pressure on the African country, which has been widely blamed for human-rights atrocities and genocide against people living in its Darfur region. The holdings amount to only 0.18 percent of the university’s endowment, according to a UMass news release. The move follows similar announcements last year by a number of American colleges and universities, both private and public. —Andrew Mytelka