Denying the Iranian government nuclear weapons and prodding it to improve human rights will demand the dedication of American diplomats, democracy activists and intelligence officers. It also will require the moral clarity and savvy long-term business views of business men and women willing to forgo profits from everything from Iranian-government hotel guests to lucrative contracts in the Iranian petroleum industry. Now is the time for “private sanctions,” where all businesses come together to stop doing business in Iran — a small price to pay to prevent Iran from getting the bomb.