What heavyweight champion nicknamed "The Manassa Mauler" starred in Daredevil Jack?
Jack Dempsey William Harrison "Jack" Dempsey (June 24, 1895 – May 31, 1983), nicknamed "Kid Blackie" and "The Manassa Mauler", was an American professional boxer who competed from 1914 to 1927, and reigned as the world heavyweight champion from 1919 to 1926. A cultural icon of the 1920s, Dempsey's aggressive fighting style and exceptional punching power made him one of the most popular boxers in history. Many of his fights set financial and attendance records, including the first million-dollar gate. Dempsey is ranked as tenth on "The Ring" magazine's list of all-time heavyweights and seventh among its Top 100 Greatest Punchers, while in 1950 the Associated Press voted him as the greatest fighter of the past 50 years. He is a member of the International Boxing Hall of Fame, and was inducted into "The Ring"'s Boxing Hall of Fame in 1951.
Jack Blackburn Charles Henry "Jack" Blackburn (May 20, 1883 – April 24, 1942) was an American boxer and boxing trainer. Fighting in the first half of his career as a lightweight and later a welterweight, he was known for an exceptional defense and fought many men above his weight class, including six bouts with the great Sam Langford. He fought Joe Gans three times in no-decision bouts, defeating him once according to newspaper accounts and made good showings against Harry Lewis, Philadelphia Jack O'Brien, and Harry Greb. He found most of his fame training 1937 World Heavyweight Champion Joe Louis, but also had a significant role in training 1926 Lightweight Champion Sammy Mandell. He helped to train World Bantamweight Champion Bud Taylor and World Light-Heavyweight Champion John Henry Lewis.