Tuhia he tomokanga mō tēnei wāhanga - I whakatūria te Irish Republican Brotherhood (IRB) me te Fenian Brotherhood i Ireland me te United States, i te tau 1858 e ngā kaitōrangapū rangatiratanga, tae atu ki ngā Young Irishers. I wehewehea ēnei ki ngā rōpū whai muri i te whakahaere i ngā whakaekenga kāore i tutuki.
i runga i a Kanata e nga hoia o Irirangi o te Pakanga o Amerika, a ka whakarewahia e te IRB a Clan na Gael hei whakakapi. I Ireland ano, i ngana te IRB ki te tutu patu i te tau 1867 engari, i te mea i tino whakaekehia e nga kaiwhakanao pirihimana, he ngoikore te whakaekenga.