I don't know a single word that would replace "a group of noisy people". There's a whole bunch of adjectives that could describe that group of people - amongst synonyms of noisy
(bolding ones that would match the situations best),:
chattering, disorderly, ear-popping, ear-splitting, loudmouth, rackety, raising Cain, raising the roof, rambunctious, riotous, rowdy, screaming, tumultous/tumultuous, turned up, uproarious
and quite a few nouns to describe the situation - synonyms of ruckus
disturbance, big scene, bother, brawl, commotion, disorder, disruption, fray, fuss, hubbub, racket, stir, turmoil, upheaval, uproar
A slang expression for parents who behave in such a way is Helicopter Parents
To quote the Oxford Dictionary definition.
A parent who takes an overprotective or excessive interest in the life of their child or children
As has been suggested it is worth noting this is quite a recent inclusion into usage.
Best Answer
The word henchmen comes to mind, cadre might also be possible, or the obvious phrase corrupt followers.