Article purports to show the characteristics of building American police, attorney services, advocacy (Institute of defence counsel or Institute of attorney in law) and the courts (in view of their origin and in context of polity of the country). The author comes to the following conclusions: 1. Police and Attorney services arranged on three independent administrative and territorial levels -Federal level, State's level and local level; Advocacy - Federal level and State's level; Courts - Federal level, State's level and level of the Indian reservations; 2. Police, Attorney services and Courts represent the professional corporations and have their own organizational forms; 3. Advocacy (Institute of defence counsel) is a professional corporation, but does not have its own organizational forms (represented in the bodies of the legal profession); 4. police authorities of different levels are in relationships coordination; 5. Federal Police has no organizational unity, its organs entwined relations coordination; 6. State police and local police have organizational unity, the local police is under the control of the State police; 7. Attorney services of each level has organizational unity; 8. Federal courts, State courts and the courts of Indian reservations represent hierarchical system; 9. unity of each of the judiciary is ensured by the highest judicial authorities; 10. United States Supreme Court is the highest judicial body in relation to all the courts of the country and ensures the unity of all judicial systems.