Throughout his criminal career, Alvin Karpis was involved in several significant heists and criminal activities that garnered attention from the authorities and the public alike. His partnership with other notorious criminals, such as Ma Barker and Baby Face Nelson, solidified his reputation as a formidable figure in the world of organized crime. Despite his fearsome reputation, Karpis was ultimately captured by the authorities and sentenced to life in prison, marking the end of his reign as a public enemy.