Notice how you said a group of concerned citizens is a lobby, not a lobbyist. The line gets crossed when you go from a group of actual human constituents colle

Notice how you said a group of concerned citizens is a lobby, not a lobbyist. The line gets crossed when you go from a group of actual human constituents collectively asking a representative for something to either a corporation asking a representative for something or a group retaining the services of a professional individual whose job it is to convince politicians of something. Lobbies are mostly ok. Lobbyists and corporations have no defensible place in politics.