Socioeconomic status is not a protected legal class or group under anti-discrimination laws that govern U.S. workplaces. Moreover, it could likely prove difficult to define class discrimination (which manifests as obvious or subtle expressions of speech, education level, personal wealth, or other indicators of status), but it remains a cultural issue in workplaces and in the hiring process. Below are resources to help define the problem and articles laying out steps to counteract the effect of this bias.
Defining Classism