I'll just add that the national security law in many ways is not distinct if you're comparing it to other mainland laws. But let's recall that Hong Kong is a jurisdiction that has long enjoyed an independent, highly professional judicial system that protected the rights to a fair trial and had respected prosecutors and a reliable, incredible police force gathering information. A lot of that began to change in the last couple of years, and the NSL really guts that system.
On August 11th, 2020. See this statement in context.