Sinn Fein is an Irish political group founded in 1905. It is a left-wing, nationalist party that seeks to end British rule in Northern Ireland and create a united Ireland. The acronym 'FEIN' stands for 'Fianna Fail', which translates to 'Soldiers of Destiny'. The party has been a major force in Irish politics since its founding and is currently the second-largest party in the Republic of Ireland.