Sokrat Albert Kirshveng (Bulgarian: Сократ Албърт Киршвенг; c. 1882 – April 14, 1937), known as The Killer with the Adze (Bulgarian: Убиецът с теслата), was the first recorded Bulgarian serial killer. Between 1919 and 1937, he murdered two of his wives, his aunt and her husband, also attempting to murder his 3rd wife. He was hanged for his crimes on April 14, 1937.