Two charts that explain the difference between the U.S. Chamber of Commerce and unions
We often hear that unions are somehow on a par with corporate special interest groups when it comes to lobbying.
From 2008-2015, the U.S. Chamber of Commerce and its Institute for Legal Reform spent $792,420,000 (#1 and #3 in the graphic). This is roughly 3x what second place lobbying organization the National Association of Realtors spent.
By comparison during the same time period, the first union to appear on the list at #182, the AFL-CIO, spent $22,300,000. The U.S. Chamber of Commerce spent roughly 35x the AFL-CIO on lobbying over this eight year period.