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The Sagittaron Democratic Union (also known by the initialism SDU) is a Sagittaron separatist group in operation during the First Cylon War, opposed to Colonial Fleet and the Articles of Colonization.
Marcus Thoon is a notable officer in the SDU.
The SDU is supplied war materiel by Canceron's Prime Minister Hudson, as well as Sashenka Wenutu (Battlestar Galactica Deadlock: The Broken Alliance).