Half a century ago, harvesting California’s 2.2 million tons of tomatoes for ketchup required as many as 45,000 workers. In the 1960s, though, scientists and engineers at the University of California, Davis, developed an oblong tomato that lent itself to being machine-picked and an efficient mechanical harvester to do the job in one pass through a field.

The battle to save jobs was on.

How could a publicly funded university invest in research that cut farmworker jobs only to help large-scale growers? That was the question raised in a lawsuit filed by a farmworker advocacy group against U.C. Davis in 1979.

César Chavez’s United Farm Workers union made stopping mechanization its No. 1 legislative priority. In 1980, President Jimmy Carter’s agriculture secretary, Robert Bergland, declared that the federal government would no longer finance research that could lead to the “replacing of an adequate and willing work force with machines.”