The most well-known and politically damaging of the scandals came to light in November 1986, when Ronald Reagan conceded that the United States had sold weapons to the Islamic Republic of Iran, as part of a largely unsuccessful effort to secure the release of six U.S. citizens being held hostage in Lebanon. It was also disclosed that some of the money from the arms deal with Iran had been covertly and illegally funneled into a fund to aid the right-wing Contras counter-revolutionary groups seeking to overthrow the socialist Sandinista government of Nicaragua.
The HUD rigging scandal consisted of Department of Housing and Urban Development Secretary Samuel Pierce and his associates rigging low income housing bids to favor Republican contributors to Reagan's campaign as well as rewarding Republican lobbyists such as James G. Watt a former Secretary of the Interior.
Sewergate, the most prominent EPA scandal during this period, involved the targeted release of Superfund grants to enhance the election prospects of local officials aligned with the Republican Party.
Michael Deaver, Reagan’s Chief of Staff, was convicted of lying to both a congressional committee and to a federal grand jury about his lobbying activities after he left the government.
Inslaw Affair (1985-1994+); a protracted legal case that alleged that top-level officials of President Ronald Reagan's (R) Department of Justice were involved in software piracy of the Promis program from Inslaw Inc. forcing it into bankruptcy and then failed to appoint an independent counsel to investigate it
Savings and loan crisis in which 747 institutions failed and had to be rescued with $160 billion in taxpayer dollars (Banking scandals during GOP administration seem to be quite common, just ask GW Bush).
Debategate refers to a scandal affecting the administration of Ronald Reagan; it involved the final days of the 1980 presidential election and briefing papers that were to have been used by President Jimmy Carter in preparation for the October 28, 1980, debate with Reagan had somehow been acquired by Reagan's team.