Answer:They used force to end union activities ensure that all the union members would not have any chance of promotion. Or, they can put the union members' name on 'blacklist' that would be shared to other companies. This will make it really hard for them to find new jobs if they decided to quit their current company.
I would think that it was that there were more passage ways for people to travel with so it was easier to move around in the cities and it was easier to get from place to place.
