Unconscious bias is a term that many human resource offices are familiar with. Many companies now require employees to take training courses to become aware of their unconscious biases. However, most people fail to realize how bias they are towards another person's accent. Research has shown that people with accents are seen as less intelligent and competent, and therefore struggle to find higher-status jobs.
See "Accent prejudice is costing people the jobs they deserve", Monika Schmid, Quartz, November 8, 2019