IPRI meaning in International ?

Americans for Tax Reform (ATR) is a politically conservative U.S. advocacy group whose stated goal is "a system in which taxes are simpler, flatter, more visible, and lower than they are today." According to ATR, "The government's power to control one's life derives from its power to tax. We believe that power should be minimized." The organization is known for its "Taxpayer Protection Pledge", which asks candidates for federal and state office to commit themselves in writing to oppose all tax increases. The founder and president of ATR is Grover Norquist, a conservative tax activist.