What is the origin or reasoning behind calling someone inside an organisation feeding information to people outside it a mole?
Learn English – Why are traitors called moles
etymology
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Best Answer
In the OED there are many entries for the noun "mole". However in the one that relates to "small furry animals", in extended use there is included the figurative use of the word to mean "someone who works underground" e.g. a spy.
Note that in general sense (3a) the figurative idea has been around since the time of Shakespeare, and was used by the bard himself. However, where it relates to membership of an organisation dedicated to espionage and the security defences of a state (sense 3b), it is of far more recent coinage - and is said to have been rare before the time of the cold war. In literature it is heavily associated with the great espionage novelist of the period, John Le Carré.
The word IS NOT SYNONYMOUS with traitor. Mole refers to the type of work, and could just as easily be applied to a patriot as a traitor.
This is the full entry for sense 3.