Reviews October 1985 Trenchcoat Treachery By Michael Warder This is a dry, almost mechanical description of a poorly understood but intriguing and vitally important subject: the GRU. After the KGB, the GRU (Chief Intelligence Directorate of the General Staff) is arguably the second largest and most powerful intelligence agency in the world. To read the full article, please sign in or create a free account to view Chronicles content for 30 days. Michael Warder Michael Warder was an associate publisher of Chronicles. He is now the principal of The Warder Consultancy.