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In 1942, the British offered to teach the predecessor of the CIA their approach to counterespionage known as the Channels Theory. This theory recognized that dealing with potential threats from spies and enemies one-on-one was not feasible. Instead, the theory stated that threats should be targeted whenever they became vulnerable by relocating, communicating with their chain of command, or receiving funds. If one is able to control the channels through which these activities occur, such as transportation (trains, planes, borders), communication (telegrams, telecommunications), and financial institutions, one will be in a better position to catch spies (Naftali 2005).