In politics, lobbying, or advocacy, is the act of lawfully attempting to influence the actions, policies, or decisions of government officials, most often legislators or members of regulatory agencies, but also judges of the judiciary. Lobbying, which usually involves direct, face-to-face contact in cooperation with support staff that may not meet directly face-to-face, is done by many types of people, associations and organized groups, including individuals on a personal level in their capacity as voters, constituents, or private citizens; it is also practiced by corporations in the private sector serving their own business interests; by non-profits and non-governmental organizations in the voluntary sector through advocacy groups to fulfil their mission such as requesting humanitarian aid or grantmaking; and by fellow legislators or government officials influencing each other through legislative affairs in the public sector. Lobbying or certain practices that share commonalities with lobbying are sometimes referred to as government relations, or government affairs and sometimes legislative relations, or legislative affairs. It is also an industry known by many of the aforementioned names, and has a near complete overlap with the public affairs industry. Lobbyists may be among a legislator's constituencies, for example amateur lobbyists such as a voter or a bloc of voters within their electoral district acting as private citizens; others like professional lobbyists may engage in lobbying as a business or profession; while others are government relations support staff who work on behalf of professional lobbyists but do not actively participate in influencing or meeting face-to-face with targeted personnel enough to be considered registered lobbyists while working in the same professional circles as professional lobbyists who are legally designated as registered lobbyists.