1971 was a key year in the history of Panathinaikos. The football team reached the 1971 European Cup Final and still is the only Greek football team ever to reach the final in a major European competition. Because of this success, Panathinaikos fans increased in numbers all over Greece. Gate 13 was present in all the games of the team in the European Cup with memorable trips. 15,000 fans went to Belgrade to see Panathinaikos against the then very strong Red Star Belgrade while 20,000 traveled to London's Wembley Stadium for the final against AFC Ajax. Because of the success of Panathinaikos's football team in European Competitions, a number of supporters' clubs started reopening while other fans decided to found their own supporters' clubs. Some of the most famous new clubs were in Nikaia and Vyronas in 1972. Immediately after its foundation, the club would attend many away games with its own leaders and would very often criticize Panathinaikos's management and owners. By 1974, most supporters' clubs had their own leaders and would be present in all away matches.