How were politicians like Boss Tweed similar to industrial magnates like Carnegie and Rock - efeller?

Politician like William M. Tweed, more known as Boss Tweed, was similar to industrial magnate like Carnegie and Rockefeller because he, like Carnegie and Rockefeller, had a lot of control over different things. He was an advisor at the gas companies and various banks, he was a director of the Erie Railroads so all of these possesions directly linked him to events happening in the country - U. S. economy and government related events.