Operation Stella Polaris was the cover name for activity in which Finnish

Finland

Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

 signals intelligence records, equipment and personnel were transported into Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 after the ending of the Continuation war

Continuation War

The Continuation War was the second of two wars fought between Finland and the Soviet Union during World War II.At the time of the war, the Finnish side used the name to make clear its perceived relationship to the preceding Winter War...

 in 1944. The threat of Soviet occupation was considered too likely and an operation was formed to support guerrilla warfare in Finland after occupation.

The leader of the operation was Colonel Reino Hallamaa

Reino Hallamaa

Reino Henrik Hallamaa was a Finnish Colonel and developer and head of the Finnish Radio Intelligence during World War II.- Early life :...

, commander of Finland's code-breaking services.

The records were exploited by Swedish Intelligence until the 1980s when they were allegedly destroyed. They were also shared with Japan, Britain, France and the USA

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.