What was sectional interest groups and public interest groups?

The interests of a particular section or group of society. Trade unions, business associations and professional (lawyers, doctors, teachers, etc.) bodies are some examples of this type. They are sectional because they represent a section of society: workers, employees, business- persons, industrialists, followers of a religion, caste group, etc. Their principal concern is the betterment and well-being of their members, not society in general. Sometimes these organisations are not about representing the interest of one section of society. They represent some common or general interest that needs to be defended. The members of the organisation may not benefit from the cause that the organisation represents. The Bolivian organisation, FEDECOR is an example of that kind of an organization