White Couriers

White Couriers (Polish: Biali Kurierzy) was a group of around 20-30 Polish boyscouts and former soldiers of the Polish Army, most of whom had been associated with the interbellum sports club Junak Drohobycz. It existed between October 1939 and July 1940, when it was broken by the Soviet NKVD. The task of the White Couriers was to smuggle people from Soviet-occupied southeastern part of the Second Polish Republic, to the Hungarian province of Carpathian Ruthenia and further to Budapest. The White Couriers were part of the Grey Ranks (Polish: Szare Szeregi), a wartime codename for the underground Polish Scouting Association.

Following the Molotov-Ribbentrop Pact, eastern Poland, known as Kresy, was annexed by the Soviet Union, allied with Nazi Germany. The Soviets immediately began campaign of a large-scale mass terror, with hundreds of thousands of people deported to Siberia. The terror was mostly aimed at Polish professionals as well as their entire families.

Creation of the White Couriers was directly connected with the Soviet terror, as hundreds of people, mostly from the city of Lwow, decided to escape Soviet Union across the Soviet-Hungarian border in Eastern Carpathians, which had been established as a result of Soviet and Nazi aggression of Poland. The Couriers were mostly young men in their 20s or even teens, members of the prewar Polish Scouting Association and athletes of the Junak Drohobycz sports club. They knew the landscape very well and within 10 months they managed to smuggle an unknown number of persons. On their way back from Hungary, they took money, Polish-language newspapers published in the West as well as orders of the Government in exile.

...
Wikipedia