This effectively foreclosed a potential Uribe run for president in 2014. The Constitution has since been amended to limit the president to a single four-year term, restoring the status quo that prevailed before 2005. In late 2010, a few months after leaving office, Uribe was named visiting scholar at Georgetown University's Walsh School of Foreign Service, where he taught students in different disciplines as a guest lecturer in seminars and classes. In 2011, Uribe was granted an honorary award by the Latin American Student Association of Georgetown, for his leadership and commitment with the Latin American community of the university. Uribe's appointment at Georgetown sparked controversy. In September, more than 150 scholars, including 10 Georgetown professors and leading experts on Latin America and Colombia, signed a letter calling for Uribe's firing. "We don’t think we should lend the legitimacy of the university to him," one Georgetown professor argued. A Colombian humorist suggested Uribe teach a course on wiretapping, which his administration illegally conducted on opposition figures, human rights workers, journalists and Supreme Court justices. Many students protested, with some hanging banners calling him a "mass murderer" for the deaths of thousands of civilians that the army later dressed up as guerillas  In November 2010, while at the Georgetown campus, Uribe was served a criminal subpoena in the case "Claudia Balcero Giraldo v. Drummond", regarding hundreds of civilians murdered by paramilitary forces loyal to Uribe. After a year at Georgetown, Uribe left to continue with his personal endeavors in Colombia. In October 2012, News Corporation welcomed Uribe to the Board of Directors upon the retirement of Andrew Knight, John Thornton, and Arthur Siskind. In 2012, Uribe joined the Leadership Council of Concordia, a nonprofit organization in New York City that creates public-private partnerships. In 2018 new declarations are part of a growing body of evidence suggesting that the Uribe family was directly involved in training and directing the operations of the outlaw paramilitary groups from their own ranch, located in the region of Antioquia. This revelations added fuel to an ongoing Supreme Court investigations of the former president's own ties to massacres and assassinations during the 1990s—acts the Court says are "crimes against humanity." Prosecutors accuse Uribe of helping to plan paramilitary massacres in La Granja (1996), San Roque (1996) and El Aro (1997) while he was governor of Antioquia, and the February 1998 assassination of Jesús María Valle, an attorney and human rights defender working with victims in those cases.