Fritz Kolbe was a German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 diplomat

Diplomat

A diplomat is a person appointed by a state to conduct diplomacy with another state or international organization. The main functions of diplomats revolve around the representation and protection of the interests and nationals of the sending state, as well as the promotion of information and...

 who became America's most important spy against the Nazis in World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

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Fritz Kolbe was born in Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

. He was employed as a junior diplomat by the German foreign ministry

Foreign Office (Germany)

The Foreign Office is the foreign ministry of Germany, a federal agency responsible for both the country's foreign politics and its relationship with the European Union. From 1871 to 1919, it was led by a Foreign Secretary, and since 1919, it has been led by the Foreign Minister of Germany...

 before World War II and had postings to Madrid

Madrid

Madrid is the capital and largest city of Spain. The population of the city is roughly 3.3 million and the entire population of the Madrid metropolitan area is calculated to be 6.271 million. It is the third largest city in the European Union, after London and Berlin, and its metropolitan...

 and Cape Town

Cape Town

Cape Town is the second-most populous city in South Africa, and the provincial capital and primate city of the Western Cape. As the seat of the National Parliament, it is also the legislative capital of the country. It forms part of the City of Cape Town metropolitan municipality...

, but his refusal to join the Nazi Party led him to be assigned lowly clerical work in Berlin from 1939. He was influenced by the anti-Nazi surgeon Ferdinand Sauerbruch

Ferdinand Sauerbruch

Ernst Ferdinand Sauerbruch was a German surgeon.Sauerbruch was born in Barmen , Germany. He studied medicine at the Philipps University of Marburg, the University of Greifswald, the Friedrich Schiller University of Jena, and the University of Leipzig, from the last of which he graduated in 1902...

 and around November 1941, became determined to actively help defeat the Nazis.