Benjamin Sack, former owner of the Boston-based Sack Theater chain, died April 4. He was 92.Lynn, Mass. native was running a scrap metal business when he acquired a movie theater in 1948. Known for his feistiness and showmanship, over the next two decades he built operations into a large, independent theater chain credited with revitalizing Boston night life in the 1950s and 1960s. The three-screen Cheri, opened in 1966, was the city’s first multiplex. He sold the chain in 1968, but remained its president until 1974 when he was forced out in a corporate reshuffle. The remaining and successor theaters are now part of the Loews Cinemas chain. Survivors include his wife Barbara, a daughter, two sons, two stepsons, four grandchildren, and four great-grandchildren.