About the Author

H. Keith Melton is an intelligence historian and the bestselling author of multiple books on clandestine technology. Melton is a founding member of the Board of Directors for the International Spy Museum in Washington, DC. Michael M. Hasco is an international business executive who for 25 years has been a collector and historian of clandestine technology. Detlev Vreisleben is a retired telecommunication engineer and researcher for 20 years in the technology of the Stasi.