Creaghe was born in Limerick, Ireland in 1841, and in 1865 he graduated from the Royal College of Surgeons in Dublin, becoming a doctor.

On the group's first public appearance, it sported a banner reading "No God, No Master" at the May Day demonstration.

In 1891 Creaghe wrote "give me Anarchists willing to die NOW if necessary for Anarchy, and if you can find me 15 or 20 to join me I promise you we will make an oppression of the enemy" [1] In 1892, he left Sheffield to go back to Argentina via Liverpool, London, and Spain.

In 1911, Creaghe left Argentina once again, eventually arriving in Los Angeles, where he collaborated with Mexican anarchists.

Both were involved in the Magonista rebellion of 1911 in Baja California; after the start of the Mexican Revolution, they supported the country's anarchist movement.