One day during his first penitentiary term (in Prince Albert, Saskatchewan), the warden received an anonymous letter warning him that Boyd was plotting a breakout. Boyd was duly kept indoors -- and thus avoided having to join the other inmates working on the prison farm in the winter. The letter's author? Boyd, of course.
[Following their escape from a Toronto jail in 1952, several members of the Boyd gang became the objects of the largest manhunt in Canadian history.]