What parents need to know
Parents need to know that there is a depiction of fascist thuggery, concentration camps, and violence directed against the "non-Aryans" (Jews, primarily; no specific mention of gypsies, Catholics, Poles, Slavs, etc.) of Europe. Chaplin's approach is way milder than the Schindler's List horrors and newsreel footage of corpse-piles that were to confront shocked moviegoers in later years. Some viewers might think it's even too mild, though that's an unfair burden to put on this film.