It’s two weeks before Thanksgiving, and a crowd of 500 people has filled the Silicon Valley Commonwealth Club to hear former U.S. Labor Secretary Robert Reich discuss a decidedly less than festive topic: How the economy is leaving most Americans behind. The subject, which inspired Reich’s latest book, Saving Capitalism, hits particularly close to home here, where uber-rich tech titans coexist with legions of low-wage workers, even as the middle class is increasingly squeezed out of nearby communities like Redwood City and Milpitas by ever-rising housing prices.