With the reduced leverage and power of the unions - in some industries - viable alternatives have come to the fore.
Plant councils, employee representative groups and management/worker committees are now common.
With agreed procedures for grievances, disputes etc. Often - with an independent/outside arbitrator, when required.
Industrial action doesn't happen as much because of this.
However the alleged and robust management style of Ms Patel seems extreme - bordering on harassment and even slander, if true.
Thus falling, perhaps, outside the terms of agreed procedures.
Evidence will be key - who saw/heard what? In my experience of large organisations - knives were drawn rather surreptitiously...