A note should be made immediately. If one follows consistent and logical reasoning, it is not difficult to arrive at a certain semantic dead end: sooner or later it becomes clear that no classes exist, since precise definitions for them cannot be established. For example, Marxism was invented by members of the middle class, and they were always the main revolutionary instigators. Likewise, it becomes clear that a certain significant social activity is almost always carried out or inspired by people who, by all marks—education, qualifications, even income—are members of the middle class. They very often lead both revolutions and counterrevolutions, and they also constitute the unprincipled passive “swamp.” In other words, it is impossible to understand where they act as private individuals and where as representatives of some group. The only way to avoid these dead ends while remaining within the subject matter is to decide in advance that we are reasoning within the framework of human activity, not natural sciences. That is, we are interested in situations where large groups of people play similar social roles, not in universal models.