Before World War II, the town had a Jewish community of 300 or so. During the German occupation of Poland, the Jews were forced to live in a small ghetto. In 1940, the German gendermerie and SS carried out expulsions of local Poles, who were sent to a transit camp in Kutno and then deported to forced labour in Germany.[3] In 1941, the Jews were forced to demolish a local church so Germans could photograph it for their anti-semitic propaganda. In early 1942, the 250 Jews left in the ghetto were deported to the Chełmno extermination camp to be murdered. The number of Sanniki Jews who survived is unknown.[4] From 1943 to 1945, the town was renamed by the German occupiers to Sannikau.
^Wardzyńska, Maria (2017). Wysiedlenia ludności polskiej z okupowanych ziem polskich włączonych do III Rzeszy w latach 1939-1945 (in Polish). Warszawa: IPN. p. 217. ISBN978-83-8098-174-4.
^Megargee, Geoffrey (2012). Encyclopedia of Camps and Ghettos. Bloomington, Indiana: University of Indiana Press. p. Volume II 100–101. ISBN978-0-253-35599-7.
