WASHINGTON -- Corporate misbehavior remains much in the news in America. One day it is Enron; next it is the New York Stock Exchange. Big Labor, too, must routinely be called to account.

Now comes a study, "Green-Peace, Dirty Money: Tax Violations in the World of non-Profits," from Public Interest Watch, demonstrating the importance of scrutinizing nonprofit organizations.

PIW charges the radical environmental group Greenpeace with misusing tax-exempt donations for political purposes. Greenpeace, it says, is "the most egregious offender we reviewed," and thus warrants a thorough investigation.