What is a group within a country promoting its own interest? sect clan faction patriarch

The answer is Faction.

Factions are described as pockets of organized dissent within a larger group, especially in the context of politics.

However, two political parties competing in a general election is NOT an example of a faction.

A single political party, breaking into two, on the basis of divergent views and objectives is a classic example of a faction.

Ibelieve the answer to be e