Poor people will not get adequate working conditions because the boss can hire illegals and threaten to just call immigration.
That is why the bosses are exciting idiots against immigrants with all their medias. They know damn well you cannot eradicate a whole ethnicity, nor stop human flows without atrocities, but as long as the idiots keep whining about immigrants, they will get the cheap labour.
The social-nationalists are just digging their own graves, really.
Here's an idea: open the borders AND give people decent work condition.