At 78 years old, Saul Sanchez took pride in his routine: showing up before 5 a.m. at a Greeley, Colo., beef processing plant to snag a good parking space and read the Bible before his shift. After work he would shower, eat dinner and go to sleep.

On March 19, Mr. Sanchez came home, showered and went straight to bed, his daughter said. He told family members he was tired but went to work the next day at the plant owned by JBS USA Holdings Inc. It turned out to be his last day on the processing line where he had cut meat for…

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