The US government maintains a “No Fly List” and airlines are required to check passengers against it before allowing them to fly. They maintain other lists that trigger increased security screening and potentially harassment.
The lists are pre-crime profiling. Not even based on science. And it’s also done very very poorly. People get on the list by mistake, because they’re related to someone who is on it, or because they visited the wrong country in the wrong year. .
These are secret lists that people haven’t been entitled to know they are on, how they got on, or to confront the evidence relied upon to put them on it. Legally there is very little recourse, and when challenged the government claims ‘state secrets.’