This volatile, stage-trained comic actor made his film debut playing dual roles in "Du Barry Was a Lady" (1943). Mostel's solid, bulky build and heavy-lidded eyes made him a convincing heavy, but his promising film career (e.g., "Panic in the Streets" 1950) was cut short when he was blacklisted following his testimony before the House Un-American Activities Committee in 1951. His fortunes revived in the early 1960s with his maniacally comic Broadway performance in "A Funny Thing Happened on the Way to the Forum" (1962) and, as Tevye, in "Fiddler on the Roof" (1964). Mostel turned in a landmark