Movie with children, boy who leaves on a zip line

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Okay, this is a very fuzzy memory. I only remember one scene.
I would have seen this movie before 1980. I saw it on television, so it could be a LOT older. My "feeling" is that is was 30s, 40s or 50s. I may have been channel surfing, so maybe only saw one scene.
It may have been in black and white (or maybe I saw it on a black and white TV)
I remember a young boy walking outside for some reason, then he arrives in an outdoor place where suddenly there are lots of other children, with different ages, and they are all yelling things at the boy like "Leave! Leave! Get out of here!". I remember at least one boy crosses a river by a zip line to come and yell "Leave! Leave!".