Robert Redford plays John Dortmunder, the mastermind behind the diamond heist.
George Segal portrays Andrew Kelp, a skilled thief and member of Dortmunder's team.
Ron Leibman takes on the role of Stanley Murch, another member of the heist team.
Paul Sand plays Alan Greenburg, a key member of Dortmunder's crew involved in the heist.
Moses Gunn portrays Dr. Amusa, a character entangled in the heist plan.
William Redfield plays Lt. Hoover, a law enforcement officer involved in the diamond heist investigation.
Topo Swope portrays 'Sis' Clara Kelp, a character connected to one of the team members.
Charlotte Rae plays Ma Murch, Stanley Murch's mother in the film.
Graham Jarvis portrays Frank, the Prison Warden overseeing a character involved in the heist.
Christopher Guest plays a Policeman in the movie who becomes involved in the heist investigation.
Zero Mostel portrays Abe Greenberg, a character connected to the heist's planning and execution.
Harry Bellaver plays Rollo the Bartender, a minor character in the film.
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