What is the main feature of public-interest groups?

What is the main feature of public-interest groups? Their efforts benefit people who are not even members of the group. bringing grass-roots pressures to bear on public officials.

The way this small state - large state compromise guards against tyranny is that small states and large states have one note: i am sorry but i was not able to give you the full answer. but i got this answer from

It can provide a social code to protect each citizen's future economical earnings. and then obviously defending the country from invading countries.