Organizations
- Sicherheitsdienst, the intelligence service of the Nazi SS
- Sinistra Democratica or Democratic Left, an Italian political party
- Social Democrats (Slovenia), a left-wing Slovenian political party
- Stronnictwo Demokratyczne, Democratic Party, a defunct Polish party
- Sweden Democrats, a nationalist party in Sweden
- Swiss Democrats or Schweizer Demokraten, a right-wing political party in Switzerland
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