league affiliates are often informally referred to as "farm teams" and a major league player's misfortune of being sent back to the minors is sometimes described as being "farmed out". The farm system as it is recognized today was invented by Branch Rickey, who – as field manager, general manager, and club president – helped to build the St. Louis Cardinals dynasty during the 1920s, 30s, and 40s. When Rickey joined the team in 1916, players were commonly purchased by major league teams from independent, high-level minor league clubs. Rickey, a keen judge of talent, became frustrated when the players he had identified for purchase at the A and AA levels were offered for bid and sold by those independent clubs to wealthier rivals such as the Chicago Cubs and the New York Giants. With the support of Cardinal owner Sam Breadon, Rickey devised a plan whereby St. Louis would purchase and control its own minor league teams from Class D to Class AA (the highest level at the time), thus allowing them to promote or demote players as they developed, and "grow" their own talent. The talent pipeline began at tryout camps that St. Louis scouts conducted throughout the U.S. "From quantity comes quality," Rickey once observed, and, during the 1930s, with as many as 40 owned or affiliated farm teams, the Cardinals controlled the destinies of hundreds of players each year. (The reserve clause then bound players to their teams in perpetuity.) The Cardinals won nine National League pennants and six World Series championships between 1926 and 1946, proving the effectiveness of the farm system concept. Indeed, the second club to fully embrace such a system, the New York Yankees, used it to sustain their dynasty from the mid-1930s through the middle of the 1960s. When Rickey moved to the Brooklyn Dodgers as president and general manager in 1943, he built a hugely successful farm system there as well after the end of World War II. The teams that ignored the farm system in the 1930s and early 1940s (such as the Philadelphia A's and Phillies and the Washington Senators) found themselves falling on hard times. The existence of the minor league system is due in part to MLB's ability to include a reserve clause in its contracts with minor league players, which gives the major league team exclusive rights to a player even after the contract has