Silicon Valley's poorest workers tell government 'we can't live like this'

Despite the tech boom, cafeteria staff, security workers and bus drivers have told US labor secretary Thomas Perez they feel like 'second-class citizens'

At Intel's corporate headquarters in Santa Clara, California, the highly paid engineers and developers directly employed by the computer chip company wear blue identification badges.

Janitors, electricians, gardeners, security guards and cafeteria workers employed by various subcontractors wear green badges.