As homo socius, the man lives in a community. Because the law deals with relationships between people, it is necessary to know the fundamental characteristics of these relationships, which are established in a community between people. Because all major social changes involve crowds, legislation and regulation must know how to address collectives, how they are influenced, how collective emotions are formed, and how they can effectively deal with external behavior in and between groups. This Article presents basic elements of crowds that should be included in legal decisions, especially in general ones. The Article shows potential applications of crowd elements in the law presented as a systemic arrangement of complex adaptive systems that can be reflected in the determination of public opinion through crowds. When a legal system in the right meaning of the word “system” determines public opinion and implements actions through crowds, it could be more effective and efficient and thus also more legitimate.