What is "galleanists"

Galleanists, or Galleanisti, was a group of Propaganda of the deed anarchists of working-class militants spread across Italian immigrant communities of the U.S. throughout the late nineteenth and early twentieth century.Their activity crystallized around the works of Italian anarchist Luigi Galleani and his paper, Cronaca Sovversiva (The Subversive Chronicle). The group was responsible for many terrorist attacks across U.S, with their most famous being the 1920 attack on Wall Street, one of the deadliest terrorist attacks in the U.S history.