1. This company doesn’t employ any manual laborers. Everyone who works for this company is a white-collar worker.
2. Dick likes to work outside in the fresh air and sunshine. He wouldn’t be very happy as a white-collar worker in an office somewhere.

Antonym: blue-collar worker. The expression describes the color of the collar (and therefore the business shirt) worn by office workers. A manual laborer would not wear a white shirt because it would get dirty very quickly and be hard to keep clean.