In summary, is the position this? The Trade Union movement brought workers together and through solidarity obtained improvements in pay, working conditions and safety for their members, but by the 60s and 70s they had become increasingly militant and had taken on a political dimension. And the cost of that was that solidarity was no longer something to be asked for or encouraged - it was something to be imposed through the intimidation of working people, if necessary.
Labour supporters rarely seem to want a talk about the 10% asset seizure. Can't think why...