Earlier quoted context omitted.
>Also the historical union attitude towards scab labour is another way to prevent this. You mean violence? This is one of the reasons many people don't like unions.
Yes, I do mean violence. Employers have also heavily utilized violence. Then they turned to the law and misinformation. Violence is a last resort.
According to Wikipedia (not definitive I know) anti-union violence ended in the 1950s. Justifying current day violence with cites to events 70 years ago is absurd.