Hours before actor Alec Baldwin fatally shot a cinematographer on the New Mexico set of "Rust" with a prop gun, a half-dozen camera crew workers walked off the set to protest working conditions. The camera operators and their assistants were frustrated by the conditions surrounding the low-budget film, including complaints about long hours, long commutes and waiting for their paychecks, according to three people familiar with the matter who were not authorized to comment. Safety protocols standard in the industry, including gun inspections, were not strictly followed on the "Rust" set near Santa Fe, the sources said. They said at...