Kirchhoff's mother was as friend of Sonia Liebknecht, wife of
Karl Liebknecht. From an early age Kirchhoff was involved in radical politics. In the early 1920s he distributed
Die Aktion and may have been a member of the
AAU and
KAPD. From 1938 to at least 1940, Kirchhoff was a militant of a group called the Grupo de Trabajadores Marxistas (GMT) in Mexico. Because the GMT called for
revolutionary defeatism in Spain, the Mexican Trotskyists alleged that they were witting or unwitting agents of the Gestapo. Despite the hostile political climate, the GMT managed to publish three issues of their journal
Comunismo.
Comunismo again defended the positions of the communist left: the identification of the USSR as capitalist, revolutionary defeatism in all warring nations, etc. == Later life ==