Since the 1960s, John C. Calhoun's white supremacist beliefs and pro-slavery leadership had prompted calls to rename the college or remove its tributes to Calhoun. The racially motivated church shooting in Charleston, South Carolina, led to renewed calls in the summer of 2015 for Calhoun College, one of 12 residential colleges, to be renamed. In July 2015 students signed a petition calling for the name change. They argued in the petition that—while Calhoun was respected in the 19th century as an "extraordinary American statesman"—he was "one of the most prolific defenders of slavery and white supremacy" in the history of the United States. In August 2015 Yale President Peter Salovey addressed the Freshman Class of 2019 in which he responded to the racial tensions but explained why the college would not be renamed. He described Calhoun as "a notable political theorist, a vice president to two different U.S. presidents, a secretary of war and of state, and a congressman and senator representing South Carolina". He acknowledged that Calhoun also "believed that the highest forms of civilization depend on involuntary servitude. Not only that, but he also believed that the races he thought to be inferior, black people in particular, ought to be subjected to it for the sake of their own best interests." Student activism about this issue increased in the fall of 2015, and included further protests sparked by controversy surrounding an administrator's comments on the potential positive and negative implications of students who wear Halloween costumes that are culturally sensitive. Campus-wide discussions expanded to include critical discussion of the experiences of women of color on campus, and the realities of racism in undergraduate life. The protests were sensationalized by the media and led to the labelling of some students as being members of Generation Snowflake.