durchstechen — to pierce through. The verb means to pass confidential information secretly to the press or the public. A dictionary example reads: Um Gegner zu schwächen, werden gezielt Interna durchgestochen. “To weaken opponents, internal matters are deliberately leaked.”
der Buschfunk — bush radio. News and rumors that travel by unofficial channels. In April 1990 an East German newspaper wrote that rumors about a prison had for years reached the public only per Buschfunk and through Western media.
der Flurfunk — hallway radio. Unofficial news that travels inside a company or an authority.
der Nestbeschmutzer — the one who fouls the nest. A person who speaks badly of their own family or group to outsiders.