Who was known as
the great commoner

Pitt was also known as the Great Commoner, because of his long-standing refusal to accept a title until 1766. Pitt was a member of the British cabinet and its informal leader from 1756 to 1761 (with a brief interlude in 1757), during the Seven Years' War (including the French and Indian War in the American colonies).

Explanation:

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.