Extortion of money by threats to divulge discrediting information.
Detective screen thriller 1929, directed by Alfred Hitchcock. The climactic chase scene through the halls and over the roof of the British Museum is the film's highlight.
This was his first feature film with synchronized sound and it festured a number of other innovations, such as an intricate narrative structure that elevated the story of murder in self-defense and blackmail out of the ordinary.
Criminal offense of extorting money with menaces or threats of detrimental action, such as exposure of some misconduct on the part of the victim.

1. To exert pressure on someone through threats; SYN. blackjack, pressure.
2. To obtain through threats.