His older brother, Kurt Sindermann, also entered politics as a member of the Communist Party and sat on the Saxon state parliament from 1929 to 1933.
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In March 1935, he again was arrested for attempted high treason, tortured and put in solitary confinement for six years at Waldheim jail.
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After 1946 he was a member of the Socialist Unity Party (SED), created from a forced merger of Communists and Social Democrats in the Soviet Occupation Zone.
Louis Horst | Horst Liepolt | Horst Hrubesch | Horst Köhler | Horst | Horst Schumann | Horst Buchholz | Horst Wessel | Horst Stein | Horst Muhlmann | Horst Jankowski | Horst Bredekamp | Horst aan de Maas | Hans Horst Meyer | Horst Heese | Horst H. Baumann | Horst Fascher | 18th SS Volunteer Panzergrenadier Division Horst Wessel | Horst Zuse | Horst Wohlers | Horst-Wessel-Lied | Horst von der Goltz | Horst Steinmann | Horst Schmid | Horst-Rüdiger Schlöske | Horst Rosenkranz | Horst Niemack | Horst Mahler | Horst Lippmann | Horst Kwech |