Personally? I think the humans win, but not without serious losses. The first 50 or so humans are going down effortlessly, that much is obvious, but by that point the gorilla would be exhausted. The one thing we have over other animals is that we have really good stamina. Which means we'll be still ready to go even when the gorilla is completely spent. Individually we wouldn't be able to do a lot of damage to the gorilla but 50 of us could definitely mess it up, especially if it's already too tired to do anything.
So yeah, 100 people could definitely take out a gorilla even unarmed, this isn't grizzly bear, after all. The real question is trying to convince the first 50 people to sacrifice themselves to a gorilla