Put some of their names into these services. Cops, feds. Lookup some high-profile court cases, see if you can get names of witnesses.
Now let's see if they care.
If they start to care they'll shoot the messenger which in this case is you. Don't poke the bear.
This is why someone who has a large stage should do it, like a journalist or a performer or a politician. They can't come after them without Streisand effecting it.
"Well, they forced my hand, I'm going to call the police..."