The Arms Crisis was a political scandal in the Republic of Ireland in 1970 in which Charles Haughey and Neil Blaney were dismissed as cabinet ministers for alleged involvement in a conspiracy to smuggle arms to the Irish Republican Army in Northern Ireland. At the ensuing Arms Trial, charges against Blaney were dropped, and Haughey, along with co-defendants Captain James Kelly, John Kelly and Belgian businessman Albert Luykx, were found not guilty of conspiracy. Blaney claimed that the then government knew about the plan, while Haughey denied this.

Charles James Haughey was an Irish Fianna Fáil politician who led four governments as Taoiseach: December 1979 to June 1981, March to December 1982, March 1987 to June 1989, and June 1989 to February 1992. He was also Minister for the Gaeltacht from 1987 to 1992, Leader of the Opposition from 1981 to 1982 and 1982 to 1987, Leader of Fianna Fáil from 1979 to 1992, Minister for Social Welfare and for Health from 1977 to 1979, Minister for Finance from 1966 to 1970, Minister for Agriculture from 1964 to 1966, Minister for Justice from 1961 to 1964 and Parliamentary Secretary to the Minister for Justice from 1959 to 1961. He served as a Teachta Dála (TD) from 1957 to 1992.