White House, State Department, Commerce Department, Department of Treasury, Department of Defense, US Trade Representatives to name a few.
But to do so, they are required to either hire the services of registered lobbyists or employ them, who then on behalf of the companies or entities go to the offices of
lawmakers, policymakers, meet either the Congressmen (in most cases it is their staff) or government officials with a set of presentations and policy papers reflecting their views.
These registered lobbyists or professional whose salaries most of the time run into five figures.
Under the strict US lobbying laws, it is mandatory for each company and lobbying firms to submit a full disclosure report every quarter and is a public document, as
part of the transparency of the US Government.
Violation of the complex and extensive lobbying regulations can lead to penalties and even jail.
Notably the disclosure reports only lists out the issues, but give no hint as to what stand did the Wal-Mart had on these specific issues or how much money was spent on
each one of them.