The greater Philadelphia area has had four other football teams that played in the NFL or in leagues that attempted to compete with the NFL. The Pottsville Maroons, a member of the National Football League, played in nearby Pottsville during the 1920s. In 1925, the Maroons were briefly suspended from the NFL for playing an unauthorized exhibition game at Philadelphia's Shibe Park. The team moved to Boston in 1929, but folded at the end of the season. The Philadelphia Quakers played one season in Philadelphia as part of the American Football League, a fledgling league intent on challenging the NFL as the premier football league in the country. The team took its name from the Union Quakers of Philadelphia, a local club which had been denied entry into the American Professional Football Association (as the NFL was known before 1922). The AFL Quakers won the league championship in 1926, giving Philadelphia two football championships in one year, as the Frankford Yellow Jackets won the 1926 NFL title. However, both the AFL and the Quakers folded after just one season of existence. The Philadelphia Bell was a franchise of the World Football League, which operated from 1974 to 1975 and attempted to challenge the NFL's dominance. The league was founded by Gary Davidson, who had also led the founding of World Hockey Association and the American Basketball Association, but the WFL folded after only two years and no teams were absorbed into the NFL. The Bell played its home games in JFK Stadium, and they employed the first African-American head coach in modern professional football history (retired Hall of Fame safety Willie Wood). The Philadelphia Stars were a football team in the USFL, a league that attempted to compete with the NFL for three seasons in the 1980s. The Stars won the league championship in their second season in Philadelphia in 1983−84, but the franchise moved to Baltimore for the league's final season. The team was coached by Jim Mora, who went on to a successful coaching career in the NFL, and among its players were future NFL Pro Bowlers Sam Mills and Sean Landeta (who later played for the Philadelphia Eagles). Unlike the NFL, the league played in the spring and summer, but it folded after a failed antitrust lawsuit and an aborted attempt to directly compete with the NFL in the fall.