Question: Will Penny was a western starring the actor and activist of what nationality?

Context paragraphs:
Will Penny: Will Penny is a 1967 western film written and directed by Tom Gries starring Charlton Heston, Joan Hackett and Donald Pleasence.  The picture was based upon an episode of the 1960 Sam Peckinpah television series "The Westerner" called "Line Camp," which was also written and directed by Tom Gries.  Heston mentioned that this was his favorite film in which he appeared.  The supporting cast features Ben Johnson, Bruce Dern, and Slim Pickens.

Overland Telegraph (film): Overland Telegraph is a 1951 Western starring Tim Holt.

Buffalo Bill in Tomahawk Territory: Buffalo Bill in Tomahawk Territory is a 1952 Western starring Clayton Moore as Buffalo Bill.  Directed by Bernard B. Ray and produced by Edward Finney as his final Western, the film was the final appearance of sidekick Slim Andrews.

Aldo Addobbati: Aldo Addobbati was an Italian film producer.  In 1968 he produced Gianfranco Parolini's "Se incontri Sartana prega per la tua morte", a western starring Gianni Garko, William Berger, Fernando Sancho and Klaus Kinski.  He followed this by producing another of Parolini's and Kinski's in 1969 with the war picture "5 per l'inferno" and he also co-produced the western "Sono Sartana, il vostro becchino" with Paolo Moffa.  The film was directed by Giuliano Carnimeo and starred Gianni Garko.

Charlton Heston: Charlton Heston (born John Charles Carter or Charlton John Carter; October 4, 1923 – April 5, 2008) was an American actor and political activist.

Gun Brothers: Gun Brothers is a 1956 Western starring Buster Crabbe and Ann Robinson.  It was Crabbe's first feature film in six years.

Hoppy Serves a Writ: Hoppy Serves a Writ is a 1943 Western film directed by George Archainbaud and starring William Boyd as Hopalong Cassidy.  The supporting cast features Andy Clyde, Victor Jory and George Reeves.  The film remains noteworthy today as one of the earliest performances (his 3rd) of unshaven newcomer Robert Mitchum, who made an impression upon the studio by generating a surprising fan mail response exactly as Clark Gable had after playing an extremely similar unshaven role in "The Painted Desert", a Western starring William Boyd produced a dozen years earlier.

There Was a Crooked Man...: There Was a Crooked Man... is a 1970 western starring Kirk Douglas and Henry Fonda and directed by Joseph L. Mankiewicz.  This was the only western made by Mankiewicz, director of such notable films as "All About Eve", "Guys and Dolls" and "Cleopatra".  It was written by David Newman and Robert Benton, their first script after "Bonnie and Clyde".

The Last Outlaw (1993 film): The Last Outlaw is a western starring Mickey Rourke, Dermot Mulroney, Ted Levine, Daniel Quinn, Gavan O'Herlihy, Keith David, John C. McGinley, and Steve Buscemi, along with a variety of other known actors, which has since become a cult classic among western genre fans.  It was directed by Geoff Murphy and written by Eric Red.  It was initially broadcast on HBO on October 30, 1993.

Diablo (2015 film): Diablo is a 2015 Canadian-American psychological western film co-written and directed by Lawrence Roeck and starring Scott Eastwood, Walton Goggins, Camilla Belle and Danny Glover.  It was the first Western starring Eastwood, the son of Western icon Clint Eastwood.

Supporting paragraphs: Will Penny Charlton Heston
Answer: American