On the morning of September 21, 1976, Orlando Letelier climbed into his car on Sheridan Circle in Washington, D.C., and began his commute to work. He was a former Chilean ambassador and cabinet minister who had survived imprisonment and torture under Augusto Pinochet's regime and had rebuilt his life in exile as one of the most effective critics of the dictatorship. The car bomb that killed him, along with his American colleague Ronni Moffitt, had been planted by agents of Chile's secret police operating freely in the capital of the United States. It was the most audacious act of state-sponsored terrorism ever carried out on American soil, and it was not an improvisation. It was an operation, planned and executed within a framework that connected the intelligence services of Chile, Argentina, Uruguay, Paraguay, Bolivia, and Brazil in a coordinated machinery of transnational repression. That machinery had a name: Operation Condor. For decades, its full dimensions remained obscured, buried in classified archives, suppressed by the governments that had run it, and silenced by the fear of the survivors who had lived through it.