[1] The founding convention was held in Teplice from 30 August – 3 September 1919; the first leader of the party was Josef Seliger.

[2] Unlike right-wing German parties, the DSAP accepted Jews as members, and nominated Jewish candidates for office.

After the Munich Agreement, when the troops of Nazi Germany began occupying the Sudeten areas (on 1 October 1938), only some of the anti-Nazi opposition members could retreat into the remaining Czechoslovakian territories.

From October to December 1938, 20,000 members of the Social Democratic Party were arrested; 2,500 anti-Nazi Sudeten Germans were sent to the Dachau concentration camp alone.

On 22 February 1939 the DSAP leadership decided to cease all activities in the Czechoslovak Republic and continue working abroad as "Treuegemeinschaft sudetendeutscher Sozialdemokraten".