Thats correct, laws were inacted making certain acts and behaviours illegal, this is authoritarianism, that's controlling a population (or attempting to). The fact that its controlling in a way most people want and its with the consent of the people doesn't make it less authoritarian. A left response is to control things, the intent and effect of that control isn't relevant. I'm not saying its bad, I believe in lots of elements of control.
What I'm pointing out is that it shouldn't come as any suprise that a Left leaning party wants to control immigration, it's natural behaviour for them
What is odd, is that a party that claims to be a Laissez-faire, free market party is actually seeking to exercize heavy control on the issue, it's a sign that they are abandoning that ideology and are heading towards fascism