Lobbying (also lobby) is the act of attempting to influence decisions made by officials in the government, most often legislators or members of regulatory agencies. Lobbying is done by many different types of people and organized groups, including individuals in the private sector, corporations, fellow legislators or government officials, or advocacy groups (interest groups). Lobbyists may be among a legislator's constituencies, meaning a voter or bloc of voters within his or her electoral district, or not; they may engage in lobbying as a business, or not.
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http://en.wikipedia.org/wiki/Lobbying