This film describes the Second World Congress of Peace Defenders, held in Warsaw on November 16-22, 1950. Sheffield, an industrial city in England, was the initial location of the event, however, it was transferred to the capital of Poland at the very last moment.
| Directing | Joris Ivens | Director |
| Directing | Jerzy Bossak | Director |
| Editing | Joanna Rojewska | Editor |
| Writing | Joris Ivens | Writer |
| Writing | Jerzy Bossak | Writer |
| Sound | Jerzy Gert | Music |
| Sound | Władysław Szpilman | Music |
| Sound | Bohdan Kajan | Sound |
| Camera | Władysław Forbert | Director of Photography |
| Camera | Karol Chodura | Director of Photography |
| Camera | Franciszek Fuchs | Director of Photography |
| Camera | Seweryn Kruszyński | Director of Photography |
| Camera | Sergiusz Sprudin | Director of Photography |
| Camera | Feliks Średnicki | Director of Photography |
| Camera | Karol Szczecinski | Director of Photography |
| Camera | Mieczysław Wiesiołek | Director of Photography |
| Editing | Jadwiga Zajiček | Co-Editor |
| Crew | Stanisław Wohl | Technical Advisor |
| Production | Ludwik Hager | Production Manager |