The Fenian Brotherhood was a secret society founded in the United States in 1858 by Irish immigrants. Its primary goal was to promote Irish nationalism and achieve the independence of Ireland from British rule. The organization was named after the ancient Irish warriors known as the Fianna, and it sought to unite Irish Americans in their efforts to support the cause of Irish freedom. The Fenian Brotherhood organized various military campaigns and raised funds to support their activities. They also played a significant role in the broader movement for Irish independence, which included other groups like the Irish Republican Brotherhood. The Fenian Brotherhood's influence waned by the late 19th century, but it left a lasting legacy in Irish-American history.