Flail
The flail is a basically a weapon with a shaft with a spiked ball attached to the shaft by a chain. This weapon is brutal wherever it hits, but it's pretty short range. The example shown below is a knight's flail, or someone high up in the social classes of Europe. Most people's flails did not look like this. Below this picture you'll see a more typical flail.
This flail is a farmer's flail. It's used for agricultural purposes. But during many peasant revolutions during the medieval times in Europe, this was one example of the common weapons you'd find in the mobs.