<blockquote>Besides the money, there may have been another reason for what happened in 1919. In 1927, Charles "Swede" Risberg, the ringleader of the eight Black Sox, told the Chicago Tribune that he knew about four rigged games between the White Sox and the Detroit Tigers, and that the entire Detroit team knew too. Those games were played in two double-headers on Sept. 2 and 3, 1917.</blockquote>
via <a href="https://www.smithsonianmag.com/smart-news/1919-black-sox-baseball-scandal-wasnt-first-180964673/">The 1919 Black Sox Baseball Scandal Was Just One of Many | Smart News | Smithsonian</a>.