Names aren't secret or private information. The agents give you their names if you talk with them. A significant portion of them are on linked in. During criminal trials their names are public record. Only four FBI agents died at an "adversaries" hand in the past 20 years, one botched undercover drug bust, an agent who ran into the twin towers on 911 to help people, and two who died in raids.
These guys are cops and detectives, not secret agents and spies.
I called the police for something a couple years ago, and when I asked for a card after it was over she gave me a card where one of her names was pre-scratched out, I forget if it was her first or last.
From the article, "personally identifiable information." A name is personally identifiable information. For crimes that rely on such lists, not being on the list is your best defense.
These guys are cops and detectives, not secret agents and spies.