General terms:
* Mob: This is a common term for a large, disorderly crowd, often associated with violence or unrest.
* Throng: Similar to "mob," this term emphasizes the large and uncontrolled nature of the group.
* Horde: This implies a large, savage, or destructive group.
* Riot: This specifically refers to a public disturbance involving violence and disorder.
More specific terms:
* Vandal: This term describes someone who intentionally damages or destroys property. A group of vandals could be referred to as a band of vandals or a pack of vandals.
* Looters: This term applies to people who steal goods during a riot or other disturbance.
* Terrorists: This describes people who use violence or threats to achieve political aims.
* Wrecker: This term can be used for someone who intentionally damages something, and a group of wreckers could be referred to as a gang of wreckers.
Metaphorical terms:
* A plague: This metaphor suggests the destructive force of the group is spreading and uncontrollable.
* A storm: This metaphor evokes the destructive power and intensity of the group's actions.
The best collective noun to use would depend on the specific context and the nature of the destruction being carried out.