In March, without public announcement or comment, the U.S. Department of the Treasury's Office of Foreign Assets Control (OFAC) published a Risk Matrix for the Charitable Sector on its website. The Introduction of the publication says the matrix is meant to help charities comply with U.S. sanctions programs that prohibit transactions with designated terrorists or certain countries. In 2006, Treasury said it was working on a draft of the matrix, and in June 2006, a group of nonprofits wrote Treasury asking for a public comment period. Treasury did not respond.