Sam Bass (July 21, 1851 ‒ July 21, 1878) was a 19th-century American train robber, outlaw, and outlaw gang leader. Notably, he was a member of a gang of six that robbed a Union Pacific train in Nebraska of $60,000 in newly minted gold from San Francisco, California. To date, this was the biggest train robbery ever committed in the USA. He died as a result of wounds sustained in a gun battle with law enforcement officers.