
Gian Maria Volonté (9 April 1933 – 6 December 1994) was an Italian actor. He is perhaps most famous outside of Italy for his roles as the main villain in Sergio Leone's A Fistful of Dollars (credited in the USA as "Johnny Wels") and For a Few Dollars More.
In Italy and much of Europe, he was notable for his roles in high-profile social dramas depicting the political and social stirrings of Italian and European society in the 1960s and 1970s, including four films directed by Elio Petri - We Still Kill the Old Way (1967), Investigation of a Citizen Above Suspicion (1971), The Working Class Goes to Heaven (1971) and Todo modo (1976). He is also recognized for his performances in Jean-Pierre Melville's Le Cercle Rouge (1970) and Giuliano Montaldo's Sacco & Vanzetti (1971).
Description above from the Wikipedia article Gian Maria Volonté, licensed under CC-BY-SA, full list of contributors on Wikipedia.

A Fistful of Dollars
1964 · as Ramón Rojo

For a Few Dollars More
1965 · as El Indio

Le Cercle Rouge
1970 · as Vogel

Operation Ogre
1979 · as Izarra

Investigation of a Citizen Above Suspicion
1970 · as Dottore

The Assassination
1972 · as Sadiel

Face to Face
1967 · as Professor Brett Fletcher

The Abyss
1988 · as Zenone

For Love and Gold
1966 · as Teofilatto dei Leonzi

The Mattei Affair
1972 · as Enrico Mattei

The Magnificent Cuckold
1964 · as Assessore

A Bullet for the General
1967 · as Chuncho Munos / 'El Chuncho'

We Are Cinema
2021 · as Self (archive footage)

Open Doors
1990 · as Giudice Vito Di Francesco

Chronicle of a Death Foretold
1987 · as Dr. Cristo Bedoya

We Still Kill the Old Way
1967 · as Professore Paolo Laurana

Spanish Western
2015 · as The Indian (archive footage)

Slap the Monster on Page One
1972 · as Bizanti