Szervezniük
Szervezniük is a Hungarian verb form. It is the third-person plural conditional mood, definite conjugation of the verb "szervezni". The verb "szervezni" itself means "to organize", "to arrange", "to plan", or "to set up".
When combined with the suffix "-niük", it indicates that "they" (the third-person plural subject) would organize
Therefore, "szervezniük kell" translates to "they must organize" or "they have to organize". "Szervezniük kellett volna"