'Occupy Wall Street' and similar protests around the nation were only the beginning. The Service Employees International Union, as much as anyone, is making sure of it. The SEIU these past several months has been playing a crucial behind-the-scenes role in transforming these rallies into the raw material for a new generation of activists. Through varied front groups, the union is taking its fight against banks, energy companies and other corporations to a new level, making sure reluctant elected officials feel their wrath. These nonprofit organizations, typically operating under monikers such as "good jobs" and "a fair economy," may seem spontaneous and benign. Yet they are union stage-managed. And as their leaders become more sophisticated and networked, unions may wind up a good deal more effective in their drive to place the U.S. economy under public control.