An organized rebellion, especially against an authority or government — is an uprising. If your entire math class joined together in rebellion against your teacher's unfair grading practices, you could call it an uprising.
The word uprising is most often used to describe a political revolt, often a violent insurrection against the established rule, but its original meaning was very different. In the thirteenth century, an uprising was a resurrection, or "the action of rising from the grave," and soon after that it meant "an action of rising from the bed." It wasn't until the late 1500's that it came to mean "revolt."