White-collar workers in the tech industry interact frequently with blue-collar workers, and many consider blue-collar workers colleagues. However, many blue-collar workers are contractors who work for a different company. A nonprofit in the Bay Area is drafting standards for “responsible contracting.” These standards will allow tech firms to be graded based on their service jobs, in comparison to these guidelines.
See "Tech workers want to grade companies on quality of blue-collar jobs", Melia Russell, The San Francisco Chronicle, August 23, 2019