It's necessary to reign in the hedge funds that shop around to find companies to invest in then squeeze for higher profits (always at the expense of innovation and employee welfare). Read about Paul Singer and his Elliott hedge fund - he's truly an awful human being. (It's a very long read.)

It's necessary to address the Citizens United ruling that allows corporations to have a voice as if they're people. Except they're really really rich people who have made the political climate all the more fraught since that ruling. Thank you, supreme court.

It's necessary to regulate the ability of companies to purchase back their own stock - it didn't used to be possible, but the banking and investment regulations changed and suddenly investment isn't in the company and it's product and people, it's in buying back stock. Ask Senator Elizabeth Warren about this.