The clique is a small, informal, intimate, non-kin, face-to-face group that usually manifests a "we-feeling," some well-defined customary rules of conduct, and a well- developed internal structure. A "gang" is a "clique" in which the sense of unity has been increased and the internal organization strengthened through conflict. The "network" is a set of relatively stable emotional linkages between persons that result in selective channels of communication through which intimate information and emotions may be freely transmitted to the members of a community so linked. The literature shows the typical existence of cliques or gangs in factories and some other work places, in schools or various types, in cities and other communities of relatively small size, and among the working classes of metropolitan communities. These cliques or gangs are integrated into networks of relatively intimate relationships that constitute a basic social continuum. Membership in the clique or gang meets the social needs of members and helps them deal with may practical problems. The interpersonal relationships of cliques and gangs also rigorously control members' behavior. The proposed hypothesis is that additional research may reveal that the whole typically secondary society of the city is riddled with cliques, gangs, and networks that constitute basic devices for the adaptation of persons to those societies. These groups are dynamic forces within the more formal framework of established institutions. 65 footnotes