Aktion 14f13 – code name for the Nazi campaign of mass extermination of camp prisoners unfit for work or labelled anti-social; carried out on the order of Heinrich Himmler from the spring of 1941 by the personnel of the “T4” campaign; the victims (ca. 20,000) were killed in the Nazi extermination camps in Bernburg, Hartheim, and Sonnenstein (now Kalenica).

The entry was written on the basis of source materials of the PWN printing house.