The title of this episode, "Ourselves Alone" is a rough translation of the Gaelic phrase 'Sinn Fein."
Although the Irish nationalist slogan "Sinn Fein" was first used in the 19th Century, the Sinn Fein political party was founded in 1905 to work for a united and free Ireland. It functioned as the political arm of Irish nationalism as the IRA functioned as its military arm. It has undergone several metamorphoses over the next century. Sinn Fein relied on contributions from Irish-Americans to buy arms and finance its operations.
First episode to feature Benjamin "Bugsy" Siegel