The Main Directorate of the General Staff of the Armed Forces of the Russian Federation - (Главное Разведывательное Управление/Glavnoe Razvedyvatel'noe Upravlenie) - or ‘GRU’ is one of the most inconspicuous organisations imaginable. Even among the generally taciturn cohort of Russian intelligence agencies, the GRU has been remarkable in its pursuit of secrecy. Whereas an endless stream of horror stories emanated from the Lubyanka, from the Aquarium - the GRU’s headquarters built atop a mass grave - there was only ever silence. This article will explore this most secretive and dangerous of organisations, offering a detailed assessment by comparing its Cold War past and its modern identity.