The U.S. Supreme Court has agreed to consider whether a group of human rights activists, journalists and lawyers have the legal right to challenge the U.S. government’s sweeping use of electronic surveillance. The plaintiffs, represented by the American Civil Liberties Union, say they have reason to fear their phone calls with clients and sources overseas will be monitored. Among the plaintiffs are lawyers representing prisoners held at Guantánamo Bay. The case relates to the broadening of the Foreign Intelligence Surveillance Act by Congress in 2008, which allowed U.S. officials to monitor communications in the United States if one person involved is abroad and the targets are foreigners believed to be outside the country.