Law professors aren't normally front and foremost at union protests. But in San Francisco, they joined Hilton hotel workers in Union Square. The workers have been involved in a protracted dispute with the Blackstone Group, which owns the Hilton, over health care, their workload and other issues. The annual meeting of the American Association of Law Professors is at the Hilton, but many sessions have been rescheduled outside the boycotted hotel. Ahyoung An reports: