Honey Bee Queen Getting Balled in My Bare Hand (workers trying to kill the queen)

I found this cluster of bees under one of my mating nucs. Sometimes bees will abscond from a mating nuc and I thought this was one of those tiny swarm clusters caused by a colony of bees absconding from a mating nuc but it was not. The bees were too tightly clustered and they were agitated and loud squealing was heard from deep inside.