Question: Which American film, stage, radio and television actor contributed to the screenplay of "Citizen Kane" (1941) and appeared in "Syndicate Sadists?"

Context articles: Syndicate Sadists
Citizen Kane
Raising Kane
The Battle Over Citizen Kane
Sonny Bupp
RKO 281
Al Morgan
Citizen Kane trailer
Dorothy Comingore
Joseph Cotten

Syndicate Sadists (Italian: "Il giustiziere sfida la città" ) is a 1975 "poliziotteschi" film directed by Umberto Lenzi It stars Joseph Cotten and Tomas Milian.
Citizen Kane is a 1941 American mystery drama film by Orson Welles, its producer, co-screenwriter, director and star.
 The picture was Welles's first feature film.
 Nominated for Academy Awards in nine categories, it won an Academy Award for Best Writing (Original Screenplay) by Herman J. Mankiewicz and Welles.
 Considered by many critics, filmmakers, and fans to be the greatest film of all time, "Citizen Kane" was voted as such in five consecutive British Film Institute "Sight & Sound" polls of critics, until it was displaced by "Vertigo" in the 2012 poll.
 It topped the American Film Institute's 100 Years ... 100 Movies list in 1998, as well as its 2007 update.
 "Citizen Kane" is particularly praised for its cinematography, music, editing and narrative structure, which have been considered innovative and precedent-setting.
"Raising Kane" is a 1971 book-length essay by American film critic Pauline Kael, in which she revived controversy over the authorship of the screenplay for the 1941 film "Citizen Kane".
 Kael celebrated screenwriter Herman J. Mankiewicz, first-credited co-author of the screenplay, and denigrated the contributions of Orson Welles, who co-wrote, produced and directed the film, and performed the lead role.
 The 50,000-word essay was written for "The Citizen Kane Book" (1971), as an extended introduction to the shooting script by Mankiewicz and Welles.
 It first appeared in February 1971 in two consecutive issues of "The New Yorker" magazine.
 In the ensuing controversy Welles was defended by colleagues, critics, biographers and scholars, but his reputation was damaged by its charges.
 The essay was later discredited after Welles's contributions to the screenplay were documented and Kael's own scholarship was called into question.
The Battle Over Citizen Kane is a 1996 documentary film about the clash between newspaper mogul William Randolph Hearst and actor/writer/director Orson Welles over Welles's 1941 motion picture "Citizen Kane", which is widely regarded as one of the greatest films of all time.
Sonny Bupp (born Moyer MacClaren Bupp, January 10, 1928 – November 1, 2007) was an American child film actor and businessman.
 His most notable film was "Citizen Kane" (1941), in which he appears as Junior, Charles Foster Kane III, the eight-year-old son of Charles Foster Kane and his first wife, Emily.
 Bupp was the last surviving credited member of the "Citizen Kane" cast at his death.
RKO 281 is a 1999 American historical drama film directed by Benjamin Ross and starring Liev Schreiber, James Cromwell, Melanie Griffith, John Malkovich, Roy Scheider and Liam Cunningham.
 The film depicts the troubled production behind the 1941 film "Citizen Kane".
 The film's title is a reference to the original production number of "Citizen Kane".
Al Morgan (January 16, 1920 – March 3, 2011) was an American producer of "The Today Show" during the 1960s, and a novelist best known for his trenchant look at media personalities, "The Great Man" (Dutton, 1955), which reviewers compared to "The Hucksters" and "Citizen Kane".
 It was this novel which popularized the phrase "The Great Unwashed."
 As in "Citizen Kane", a reporter sets out to gather information on a well-known deceased public figure.
 Some critics suggested the deceased character, national radio commentator Herb Fuller, was inspired by Arthur Godfrey.
 "Kirkus Reviews" commented:
The "Citizen Kane" trailer was a four-minute, self-contained, "making of" promotional featurette by Orson Welles and the Mercury Theatre, released in 1940 to promote the film "Citizen Kane".
 Unlike other standard theatrical trailers of the era, it did not feature a single second of footage of the actual film itself, but was a wholly original pseudo-documentary piece.
 It is considered by numerous film scholars such as Simon Callow, Joseph McBride and Jonathan Rosenbaum to be a standalone short film, rather than a conventional "trailer", and to represent an important stage in the development of Welles's directorial style.
Mary Louise Comingore, best known professionally as Dorothy Comingore (August 24, 1913 – December 30, 1971), was an American film actress.
 She is best known for starring as Susan Alexander Kane in "Citizen Kane" (1941), the critically acclaimed debut film of Orson Welles.
 In earlier films she was credited as Linda Winters, and she had appeared on the stage as Kay Winters.
 Her career ended when she was caught up in the Hollywood blacklist.
 She declined to answer questions when she was called before the House Un-American Activities Committee in 1952.
Joseph Cheshire Cotten, Jr. (May 15, 1905 – February 6, 1994) was an American film, stage, radio and television actor.
 Cotten achieved prominence on Broadway, starring in the original stage productions of "The Philadelphia Story" and "Sabrina Fair".
 He first gained worldwide fame in three Orson Welles films: "Citizen Kane" (1941), "The Magnificent Ambersons" (1942), and "Journey into Fear" (1943), for which Cotten was also credited with the screenplay.
 He went on to become one of the leading Hollywood actors of the 1940s, appearing in films such as "Shadow of a Doubt" (1943), "Love Letters" (1945), "Duel in the Sun" (1946), "Portrait of Jennie" (1948), "The Third Man" (1949) and "Niagara" (1953).
 One of his final films was Michael Cimino's "Heaven's Gate" (1980).