When hundreds of people marched to the Los Angeles City Council last October, urging it to pass a resolution supporting a farm worker union fight taking place in California’s San Joaquin Valley, few had ever heard the name of the company involved. That may not be the case much longer. Gerawan Farming, one of the country’s largest growers, with 5,000 people picking its grapes and peaches, is challenging the California law that makes farm workers’ union rights enforceable. Lining up behind Gerawan are national anti-union think tanks. What began as a local struggle by one grower family to avoid a union contract is getting bigger, and the stakes are getting much higher.