[1] Drawn to the left-wing intelligentsia at an early age in Berlin, Reimann associated and worked with Ernst Thälmann, Anna Seghers and Walter Ulbricht at the Romanisches Café.
[2] After the Reichstag fire in February 1933, Reimann went underground to oppose the new National Socialist regime under the resistance movement of the German social democrats and communists.
In 1934, the Gestapo continued zeroing in on his location, finally raiding his house and arresting Hu Lanqi, who later became the first female general of the Chinese National Revolutionary Army.
In that treatise, Reimann documented how the oppressive rule of the Nazi regime crushed the autonomy of the private sector through severe regulations and the threat of confiscatory fines for petty offenses.
After his migration to the United States, he lived in New York City, where he met Miriam Weber, a socialist activist, who he later married and fathered two children, before the two divorced.