The scariest legislation happened during WW1/WW2. If there’s a majority in parliament for press censorship, banning strikes outright, or sending millions of men to France without regard for their will then there’s no legal or traditional limit on what a parliamentary majority can do.
Not sure how much of that can be blamed on the system - countries with written constitutions and enumerated rights (United States, France) also implemented drafts and massively restricted individual freedoms during the wars.
The US even went so far as to imprison the leader of the Socialist Party for his opposition to the WWI draft and urging resistance. He ran his final presidential campaign from a prison cell.
