sentences:  In spite of the fact that their contribution to society is profound – in fact, society could not function without them – the other groups generally look down upon and tend to exploit them.The laborers are the peasants, serfs, clerks, short order cooks, waiters, janitors, doormen, cabdrivers, garbage collectors, truck drivers, night watchmen and factory workers who keep society running smoothly by working diligently and without complaint.Groups of each type of people make up the social classes in society.