Is it possible that these individuals and groups have too much power in the US?

Here are two easy to read charts, one from 1990 and the other from 2010.
Both charts consist of obvious powerful people and organizations. All are very real and if you have any doubt, a quick Google search will confirm it.
Why is inconceivable that these people and organizations are too powerful and have a great influence over our society, economy, and political system?
Is it that crazy of an idea that a wealthy, upper class group of people are working together for certain interests?
Please look at the two links prior to commenting.