What is the collective nouns for rioters?

There isn't a single, widely accepted collective noun for rioters. Here are some possibilities, depending on the specific context and connotation you want to convey:

Neutral:

* A crowd of rioters

* A throng of rioters

* A mob of rioters (though this term can have negative connotations)

Negative:

* A rabble of rioters (implies disorder and lack of control)

* A horde of rioters (emphasizes a large, menacing group)

* A swarm of rioters (suggests a chaotic and uncontrolled movement)

* A pack of rioters (implies a coordinated and aggressive group)

Positive:

* A group of protesters (if you want to emphasize the potential for legitimate grievance)

* A body of dissenters (if you want to focus on the ideological aspect)

Ultimately, the best collective noun depends on the specific situation and the message you want to convey.