In June 2006, seven men were arrested by the FBI and charged with plotting to destroy the tower. Deputy FBI Director John Pistole described their plot as "more aspirational than operational". The case went to court in October 2007. After three trials, five of the suspects were convicted and two acquitted. The alleged leader of the group, Narseal Batiste, was sentenced to 13½ years in prison. In response to the perceived threat of an attack, the building's largest tenant at this time, Ernst & Young, moved to North Wacker Drive in early 2009.