Challenge to Be Free (aka Mad Trapper of the Yukon and Mad Trapper) is a 1972 drama film directed by Tay Garnett and stars Mike Mazurki. Challenge to be Free was a fictionalized account of the 1931 Royal Canadian Mounted Police (RCMP) pursuit of a trapper named Albert Johnson, the reputed "Mad Trapper of Rat River".Another film exploring the same topic was The Mad Trapper (1972), a British made-for-television production.