What reagan era scandal involved the illegal sale of weapons to a terrorist wants our nation

U.S. relations with Iran during the Reagan administration went through four stages—indifference, hostility, cooperation and finally confrontation that even included some limited combat. U.S. policy was shaped largely by three events: The 1980-1988 Iran-Iraq war, the 1982 Israeli invasion of Lebanon, and the abduction of American hostages in Beirut.A scandal in the mid-1980s—involving secret arms sales to Iran in exchange for release of American hostages held by Iran's allies in Lebanon—nearly destroyed the Reagan presidency.By 1988, U.S. support for Iraq and its military operations against Iran contributed to the end of the Iran-Iraq War and a de facto defeat for the Islamic Republic. 
this should help you! =)

Where are the following