In the forty-year period between 1951 and 1991, Canadian sports car competition underwent a massive change, transforming itself from an amateur recreational pastime to a commercialized profession and from an individual sport to a spectacle for mass consumption. The Chequered Past is the story of the struggle over power and purpose within the Canadian auto sport that led to this transformation. The first comprehensive history of sports car racing and rallying in Canada, The Chequered Past traces the efforts of the national governing body - the Canadian Auto Sport Clubs (CASC) - to bring its sports car competition up to a 'world class' level, and to manage the consequences of those efforts in the second half of the twentieth century.