 Complete the following phrase:  Sheikh Omar Abdel-Rahman , Umar Abdu r-Raḥman; 3 May 1938  18 February 2017, commonly known in the United States as The Blind Sheikh, was a blind Egyptian Muslim leader who served a life sentence at the Federal Medical Center, Butner near Butner, North Carolina, United States. Formerly a resident of New York City, Abdel-Rahman and nine others were convicted of seditious conspiracy. His prosecution grew out of investigations of the 