"Uncle Gunnysack." A bogeyman of Haitian Creole folklore. He walked the streets at night, looking for children who stayed out too late. These children were carried away in his gunnysack, never to be seen again.
The name was later applied to the Milice de Volontaires de la Sécurité Nationale, the paramilitary force of François 'Papa Doc' Duvalier, Haiti's "President for Life." Those who spoke out against Duvalier would disappear in the night and were never seen again.