Aresearcher's membership on an advisory board with an organization sponsoring research can create a coi because:

The membership of a researcher on the advisory board of an organization sponsoring research can create a conflict of interest (COI) because sometimes the researcher may have more concerned with getting the organization to sponsor his research, than he is with the patients.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.