The Philadelphia Union is a Major League Soccer team that plays in the Eastern Conference. The franchise began play in 2010. The Union play at Subaru Park, a soccer-specific stadium located in Chester, Pennsylvania. The Sons of Ben is an independent supporters group that helped bring the Union to the Philadelphia area, and which continues to support the Union. The Union's top affiliate is Philadelphia Union II. Originally known as Bethlehem Steel FC as a tribute to the early 20th century soccer powerhouse, the team began play in 2015 in the second-level United Soccer League, now known as the USL Championship. Steel FC played its first four seasons at Goodman Stadium in Bethlehem, Pennsylvania, but moved to Subaru Park for at least the 2019 season because Goodman Stadium no longer meets league stadium requirements. Steel FC was renamed Union II in advance of the 2020 season. The Union have made the playoffs five times, in 2011, 2016, and from 2018 to 2020. They have also reached the U.S. Open Cup final three times, in 2014, 2015 and 2018, losing two games at home (in extra time in 2014 to the Seattle Sounders and after penalties in 2015 to Sporting Kansas City) and once on the road (in 2018 away to the Houston Dynamo). In 2020, the Union won the Supporters' Shield, given to the team in MLS with the best regular season record, the first major trophy in the team's history.