There is no shortage of opinions that the Polish league had a chance to become one of the strongest in Europe at the turn of the 1930s and 1940s. However, World War II stood in the way. It took as many as six years of careers from footballers, often during their best sporting period. Some players died on the fronts, in German concentration camps, or in Siberian exile. Some remained outside the country's borders. Others revealed their negative side by signing the Volksliste, which immediately prevented them from playing in Poland again. Thus, only a small handful from the generation known before 1 September 1939 from the pitches joined the league. Their successors were a generation growing up during wartime.
The people changed, and so did the country. Poland lost Lwów with its former Ekstraklasa clubs - Pogoń, Czarni, Hasmonea, and Lechia, and Wilno - with Śmigły. It gained, however, the greater part of Upper Silesia, Lower Silesia with Wrocław, and Pomerania with Gdańsk and Szczecin. It was therefore necessary to plant Polish identity here. Its seed was the native clubs. Soon, new regular league players were born in these cities. Sovereignty was not full, however. A communist system ruled the country. Footballers could not travel to foreign leagues. The authorities even changed the personal details of some of them! Clubs also faced a forced change of their names following the Soviet model. Hence, in the league, instead of Wisła Kraków, Gwardia appeared, Legia became CWKS, Ruch Chorzów became Unia, and Cracovia became Ogniwo. The teams were assigned to professional branches (police, military, textile, metallurgical, mining, etc.), and the footballers were officially amateurs employed at large industrial plants.
After 1945, the Polish champion was determined in a cup system for two seasons. Only from 1948 did the league get going again, and it has operated continuously ever since. Fans could also occasionally watch the exploits of top-flight footballers on Polish television. The first broadcast took place in 1957. Not long after, floodlights made their debut. Sportingly, it was a period of great isolation. Only after Stalin's death did contacts with clubs from other countries revive. A Polish team, Gwardia Warszawa, also took part in the first ever edition of the European Champion Clubs' Cup, today known as the Champions League. The national team - composed exclusively of players from the Polish league - participated in two editions of the Olympic Games (1952 and 1960). The greatest joy, however, was perhaps brought by the unexpected 2:1 victory over the Soviet Union in 1957.