New documents show the FBI monitored South African leader Nelson Mandela during his visit to the United States in 1990. Mandela had just been released after 27 years in prison. The released files show the FBI was primarily concerned with Mandela’s security amidst a number of threats from right-wing extremists. But the FBI also redacted 169 pages of documents, citing national security. The records were obtained by transparency activist Ryan Shapiro, who has sued the U.S. government to release information on its role in Mandela’s initial capture in 1962 and on why it took until 2008 for Mandela to be removed from the U.S. terrorist watch list.