What is it called when someone helps our enemy into the country?

In world war 2 and the rules for the Jewish people? What places in and around Dresden might the Allies have considered targets military significance? Why were missiles invented? Why did slaves enlist to fight in the civil war? Stalemate cold war term? An incompetent government massacres on Bloody Sunday and the high costs of World War 1 were causes of the? Why did the president invent a nuclear bomb? How much is civil war paper money worth? Why did General Grant decide to capture Petersburg? How many raf bases were there in the 1980s? How many US soldiers are at war in Afghanistan? What was the capital of Great Britain during World War 2? What combat multiplier allows a unit to transition from peacetime to war? Why did the Vietnam War destroy Americas good reputation and set people against one another? Why was the battle at Stalingrad the true turning point of the war in Europe? Which principle did the Allies adopt in the Atlantic Charter to prevent nations from threatening world peace? What boat was sunk by the Germans that contained sereval American passengers and a total of 1198 people this action pushed American closer to war? In which state did 48 counties secede from the Confederacy and join the union? What is the advantage of integrating OPSEC principles in day-to-day operations? What is the duration of Our Flags Lead Us Forward?

What is it called when someone helps our enemy into the country?