KGB: The Sword and the Shield S01E01 - Dzerzhinsky & Co.

Set up as a ‘temporary' measure by Lenin, millions of Soviet citizens would die at the hands of the secret services as internal dissent, real or imaginary, was crushed. Outside the Soviet Union, however, they were busy infiltrating German High Command, British Intelligence and America's Manhattan Project, constructing the world's first atomic bomb. Soon, Moscow had the means to build one of their own. The Cold War and the philosophy of Mutually Assured Destruction (MAD) had begun in earnest.