His first prominent film role was a small but important part in the Oscar nominated Kapò (1959).
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Other notable westerns he starred in were $10,000 Blood Money (1967) as an unofficial Django, Veangeance is Mine/$100,000 for a Massacre (1967), They Call Him Cemetery (1971) alongside William Berger as well as a supporting role in Bad Man's River with Lee Van Cleef.
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Popular in Europe but little known in America, in an interview, Garko mentioned that he had turned down the lead role in Pretty Baby (1978 with Brooke Shields).
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