In the United States, bureaucratic power is exercised in the Congress, and particularly in congressional committees and subcommittees. By aligning itself with selected constituencies, an agency may be able to affect policy outcomes directly in these committees and subcommittees. This is where an iron triangle may manifest itself. The picture above displays the concept. At one corner of the triangle are interest groups (constituencies). These are the powerful interests groups that influence Congressional votes in their favor and can sufficiently influence the re-election of a member of Congress in return for supporting their programs. At another corner sit members of Congress who also seek to align themselves with a constituency for political and electoral support. These congressional members support legislation that advances the interest group's agenda