What is the collective noun for strong complaints?

There isn't a single, widely accepted collective noun specifically for "strong complaints." However, here are some options you could use depending on the specific context:

Formal:

* A barrage of complaints: This emphasizes the intensity and volume of the complaints.

* A chorus of complaints: This implies a unified and vocal group of complainers.

* An avalanche of complaints: This emphasizes the overwhelming nature of the complaints.

Informal:

* A storm of protests: This suggests a forceful and emotional outburst.

* A litany of grievances: This highlights the list-like nature of the complaints.

* A flood of criticisms: This conveys the sheer number and intensity of the complaints.

Figurative:

* A tempest in a teapot: This suggests that the complaints are disproportionate to the issue at hand.

* A powder keg: This implies a volatile situation that could easily erupt into conflict.

Ultimately, the best collective noun will depend on the specific context and the tone you want to convey.