Marguerite Blanche was a Danish actress notable for her starring roles in British silent films.
 She was born in Copenhagen as Margaret Jessen, but emigrated to Britain where she made twelve films for director-producers such as Cecil Hepworth and Sidney Morgan.
 Her final film was Morgan's "The Woman of the Iron Bracelets" in 1920.
 Morgan then replaced her as the star of his films with his own daughter Joan Morgan.
William Friedkin (born August 29, 1935) is an American film director, producer and screenwriter best known for directing "The French Connection" in 1971 and "The Exorcist" in 1973; for the former, he won the Academy Award for Best Director.
 Some of his other films include "Sorcerer", "Cruising", "To Live and Die in L.A.", "Jade", "Rules of Engagement", "The Hunted", "Bug", and "Killer Joe".
A Window in Piccadilly is a 1928 British silent romance film directed by Sidney Morgan and starring Joan Morgan, John F. Hamilton and James Carew.
 It was made at Twickenham Studios as an independent production by Sidney Morgan.
Killer Joe is a 2011 American Southern Gothic black comedy crime film directed by William Friedkin.
 The screenplay by Tracy Letts is based on his 1993 play of the same name.
 The film stars Matthew McConaughey in the title role, Emile Hirsch, Juno Temple, Gina Gershon, and Thomas Haden Church.
 Friedkin and Letts had similarly collaborated on the 2006 film "Bug".
Lady Noggs (also known as Lady Noggs: Peeress) is a 1920 British silent drama film directed by Sidney Morgan and starring Joan Morgan, George Bellamy and Yolande Duquette.
The Thin Blue Line was the second of three documentaries William Friedkin made for producer David Wolper.
 It focused on the police force, and the experience making it influenced Friedkin on "The French Connection".
Sorcerer is a 1977 American existential thriller film directed and produced by William Friedkin and starring Roy Scheider, Bruno Cremer, Francisco Rabal, and Amidou.
 The second adaptation of Georges Arnaud's 1950 French novel "Le Salaire de la peur", it has been widely considered a remake of the first adaptation, the 1953 film "The Wages of Fear".
 Friedkin, however, has disagreed with this assessment.
 The plot depicts four outcasts from varied backgrounds meeting in a South American village, where they are assigned to transport cargoes of nitroglycerin.
The Third Round (1925) was the second silent film adaptation of the Bulldog Drummond character, starring Jack Buchanan and Betty Faire, adapted by Sidney Morgan from the novel of the same name by H. C. McNeile, and directed by Morgan.
Sidney Morgan (2 August 1874 – 11 June 1946) was an English film director, screenwriter, producer and actor.
 He directed 45 films between 1914 and 1937.
 As an actor, he appeared in the Alfred Hitchcock film "Juno and the Paycock".
To Live and Die in L.A. is a 1985 American action thriller film directed by William Friedkin and based on the novel by former U.S. Secret Service agent Gerald Petievich, who co-wrote the screenplay with Friedkin.
 The film features William Petersen, Willem Dafoe and John Pankow among others.
 Wang Chung composed and performed the original music soundtrack.
 The film tells the story of the lengths to which two Secret Service agents go to arrest a counterfeiter.

Question: What are Sidney Morgan and William Friedkin known for?
Answer: film director