From 1925 until 1953, IRFU teams dominated Canadian football, winning 18 of the 26 Grey Cups its clubs contested in that timespan (the IRFU suspended operations from 1942 through 1944 because of World War II). During this period, the calibre of play in the IRFU was recognized as being on par with any league in North America. The Big Four attracted considerable interest in the United States and even had its games televised by the National Broadcasting Company for a time during the 1950s (in fact, these games were more widely available than their NFL counterparts). This interest eventually declined as the National Football League gained prominence and the American Football League rose in popularity. During this time, the IRFU became increasingly professionalized. However, in order to keep up the pretense of amateurism, players were usually paid under the table.