the.com/lobbyist

means Someone paid to influence lawmakers on behalf of a group or industry, usually by persuading, informing, or applying pressure outside the formal legislative process.

from Rooted in 'lobby,' the entrance hall of a legislative building where members of the public could buttonhole lawmakers as they came and went. The word is often tied to the lobby of the U.S. Capitol or to hotel lobbies in Washington, D.C., where favor-seekers supposedly cornered officials — vivid stories, though the practice of waylaying politicians in entrance halls predates any single famous lobby. By the mid-1800s 'lobbyist' had become the settled term for someone who made that hallway-hovering into a profession.