The financial reform bill enacted last week is a significant step toward a much-needed modernization of our regulatory structure. It will provide tools to help mitigate and manage the next financial crisis. But the job remains unfinished until Congress addresses the housing policies that fueled the crisis — a big part of which requires reforming and dramatically scaling back Fannie Mae and Freddie Mac, the two government-sponsored housing enterprises that brought our nation’s financial system and our entire economy to the brink of collapse.