Frankfurt

Frankfurt is the largest city in the German state of Hesse and the fifth-largest city in Germany.

Frankfurt in The Man With the Iron Heart
Frankfurt became the center of the American occupation zone in Germany after World War II. In 1946, it had developed a substanial residency area, with various soldiers bringing their families into a very secured area.

As the German Freedom Front had already destroyed the Palace of Justice in Nuremberg the prior November, the US decided to try various captured Nazi officials in Frankfurt. The GFF stopped these trials by setting off a radium bomb in the American residency area. Hundreds were killed, and Frankfurt was left radioactive.