What can we do? We can fight back, and, at the global level, some reformers —  like the University of Virginia Law School’s Ruth Mason — are even feeling optimistic about the struggles ahead. For much of the last century, Mason notes, a small club of rich nations working through the Organization for Economic Cooperation and Development, the OECD, set international tax policy. The system they created rested on bilateral tax treaties designed to make sure that corporations doing business outside their home nation wouldn’t be taxed twice on the same income, once by their home country and onc...