Sozialistischer Schutzbund ('Socialist Protection League', abbreviated SSB) was a paramilitary formation in Weimar Germany, linked to the Socialist Workers' Party of Germany (SAPD).Heuzeroth, Günter. Verfolgte aus politischen Gründen: Widerstand und Verfolgung der regionalen Arbeiterbewegung in Dokumenten, Lebensberichten und Analysen : dargestellt an den Ereignissen in Weser-Ems, 1933-1945. 1989. p. 1046 SSB was active between 1931 and 1933. The organization mainly acted as guards at election campaign meetings.Bremer, Jörg. Die Sozialistische Arbeiterpartei Deutschlands <SAP>: Untergrund u. Exil 1933-1945. Frankfurt/M. [usw.]: Campus Verl, 1978. p. 53 SSB also guarded offices of the party and the Socialist Youth League of Germany.Herms, Michael, and Gert Noack. Aufstieg und Fall des Robert Bialek. Berlin: Edition ost, 1998. p. 34 The SSB wore a uniform with blue shirts, red armbands and dark blue caps. SSB earned a degree of respect for its discipline.Abgeordnete des Deutschen Bundestages: Aufzeichnungen und Erinnerungen. Boppard am Rhein: H. Boldt, 1982. p. 93

SSB was formed by members of the Reichsbanner Schwarz-Rot-Gold.Miller, Frederick Alfred. Left-wing splinter parties in the Weimar Republic At the time of the founding of the organization, the SSB had some 100 members. SSB made its first public appearance in Zwickau on 8 November 1931. Some 500 SSB members paraded through the city. On 6 December 1931 a SSB march with 500 participants took place.Voigt, Carsten. Kampfbünde der Arbeiterbewegung: das Reichsbanner Schwarz-Rot-Gold und der Rote Frontkämpferbund in Sachsen 1924-1933. Köln: Böhlau, 2009. pp. 431-432

In 1932 the Communist Party of Germany (Opposition) (KPD(O)) dissident Karl Borromäus Frank joined SAPD, and was appointed as the national chief of SSB. Frank was expelled from the party later the same year.Strauss, Herbert A., Werner Röder, Belinda Rosenblatt, Hannah Caplan, Sybille Claus, and Beatrix Schmidt. Biographisches Handbuch Der Deutschsprachigen Emigration Nach 1933 = International Biographical Dictionary of Central European Emigrés 1933-1945. München: Saur, 1980. p. 187

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