on to play professionally for the Philadelphia Union and other teams, with the balance going to college. Club culture Supporters Grassroots support was instrumental to the founding of the Philadelphia Union and the construction of Subaru Park. This backing came in the form of a supporters group known as the Sons of Ben, which was founded in January 2007. The Sons of Ben petitioned Major League Soccer to expand to the Philadelphia market until the official expansion announcement was made in January 2008. Named for Founding Father and Philadelphia icon, Benjamin Franklin, the group was included in the expansion press conference, singing their anthem, "I'm Looking Over a Four Leaf Clover", and closing the event by presenting scarves to the ownership group. They were also present on May 11, 2009, for the naming ceremony at City Hall. While the Sons of Ben are the predominant and official supporters group, smaller supporters groups also exist. These include the Tammany Saints (sections 101 and 133), the IllegitimateS (section 133), the Corner Creeps (section 134), the Bridge Crew (sections 120–121), La Union Latina (section 114), The Keystone State Ultras (section 140), and the Chester Soccer Casuals (section 140). Rivalries The Philadelphia Union's primary rivals are the New York Red Bulls and New York City FC. These rivalries exist primarily because of geographical proximity and the traditional animosities between the metropolitan areas of Philadelphia and New York City in other professional sports leagues. Most Union fans have considered the New York Red Bulls to be a traditional rival due to the team's stadium being the closest in proximity to the Union's, leading to substantial away support from each team's fan bases every time the two sides play. There have been many consequential games played between the two sides, including the Union's first playoff win in team history. However, many New York Red Bulls fans do not consider the Union to be one of their main rivals, as NYCFC and D.C. United are their main antagonists. In recent years, the Philadelphia Union's most meaningful rivalry has been with New York City FC. Though early fixtures between the two clubs did spark tensions between the two sets of fans, the rivalry reached a new level after New York City controversially eliminated the Union in the 2021 Eastern Conference Final, after the latter lost 11 players, including 6 starters, due to MLS' COVID-19 protocols. In a fixture