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fifth column
This phrase comes from the Spanish quinta columna, from the column of supporters that General Mola claimed to have in Madrid while he was leading four columns of his army to invade the city during the Spanish Civil War.
Synonyms:
apostate, back-stabber, backslider, betrayer, conspirator, deceiver, defector, deserter, double-crosser, fifth columnist, fink, hypocrite, imposter, informer, intriguer, Judas, miscreant, plotter, quisling, rat, rat fink, rebel, renegade, snake, sneak, snitch, snitcher, spy, squealer, stool pigeon, stoolie, tattletale, treasonist, turncoat, two-timer,