Giant Wall Street banks continue to threaten the well-being of millions of Americans. Back in 2000, before they almost ruined the economy and had to be bailed out, the five biggest banks on Wall Street held about 25 percent of the nation's banking assets. Now they hold more than 45 percent. In 2012, JPMorgan Chase, the largest bank on Wall Street, lost $6.2 billion betting on credit default swaps - and then publicly lied about the losses. It later came out that the bank paid illegal bribes to get the business in the first place. In May, the Justice Department announced a settlement of the biggest criminal price-fixing conspiracy in modern history, in which the biggest banks manipulated the $5.3 trillion-a-day currency market in a brazen display of collusion," according to Attorney General Loretta Lynch. Wall Street's investment bankers, key traders, top executives, and hedge-fund and private-equity managers wield extraordinary power. They're major sources of campaign contributions to both parties. In addition, a lucrative revolving door connects the Street to Washington. Key members of Congress, especially those involved with enacting financial laws or overseeing financial regulators, have fat paychecks waiting for them on Wall Street when they retire. Which helps explain why no Wall Street executive has been indicted for the fraudulent behavior that led up to the 2008 crash. Or for the criminal price-fixing scheme settled in May. Or for other excesses since then.