Powerful sources may also use their prestige and importance to the media as a lever to deny critics access to the media: the Defense Department, for example, refused to participate in National Public Radio discussions of defense issues if experts from the Center for Defense Information were on the program; Elliott Abrams refused to appear on a program on human rights in Central America at the Kennedy School of Government, at Harvard University, unless the former ambassador, Robert White, was excluded as a participant;83 Claire Sterling refused to participate in television-network shows on the
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