For the mediaeval serf, movement wasn’t an option unless your Lord moved you. If you didn’t like how your feudal master behaved, you could not vote with your feet. You had to stay where you were put, and live and work there your whole life. You could be moved of course if you were marched into a war, but you wouldn’t get any say in that, either.
These days we don’t need permission from Barons and Counts to move around – at least not within the countries of our birth. We generally need permission to move country, and countries want to control who can move where. Young, qualified, able bodied people are more welcome than others. The rich are always welcome to move and the poor are discouraged. Unless we need them for something. Plenty of industrial projects have been built on the backs of very poor workers. From the Irish navvies digging the canals to the modern Eastern European fruit picker, those with power like to move those with less power about to work for them.
It’s not so very different to the mediaeval model. Companies replace baronies, and the scales are bigger, but the effects are much the same. Now if you want to change country it’s not a baron who needs to write a letter of consent, but a company that will employ you.
We’re told it’s for our own good, and our own safety – to make sure we don’t have too many, and that we have the ones who are needed, and to keep the dangerous ones out. Our mediaeval peasant friends were told that it was about eliminating vagrancy and crime, and it meant there wouldn’t be rough, unruly people from other places coming into their place and making it all worse. Nothing much changes.
Much of the terror we experience in the west is home grown. We’re encouraged to think it sneaks in across borders to attack us from outside – something other, that we could keep out if we tried hard enough. Americans are more likely to be killed by other Americans than by anyone from ‘away’. We’re more likely to die to air pollution, traffic accidents, heart attacks and our own lifestyle choices than we are to a terrorist.
Freedom of movement can really undermine exploitation. If workers can move, then screwing someone poorer becomes that bit harder. It can help people remove themselves from wars – which are generally harder to sustain when no one is there to fight. It can help people get out of toxic systems, and escape persecution. Freedom of movement has the potential to be a source of good for the vast majority of us. It’s never been popular with feudal overlords because it undermines their power.