lobbyist
noun
a person who tries to influence legislation on behalf of a special interest; a member of a lobby.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The first person whom this apostle of lobbyism called upon in Slowburg was the mayor of that tottering capital.
From Stories by American Authors (Volume 4) by Constance Fenimore Woolson