Why was it essential for the bill of rights to be addded to the constitution? -

Without the bill of rights, there would be no established set of rights given to the people. Without it, there would be no precedent for the rights of the people, and thus the rights of the people could be bent to whatever the people in power wanted.

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.