In the mid-1990s, neo-Nazis took up the concept of "leaderless resistance". The idea was that far-right acts of violence be carried out by individuals or decentralised groups, and with no connection to a leadership structure. The idea originated in the USA and spread in Germany through networks such as Blood & Honour. Many extreme right-wing organisations had been banned, but in the early 1990s, German neo-Nazis circulated the brochure “Eine Bewegung in Waffen” [A Movement in Arms], which promoted such a reorganisation. The brochure called for lone perpetrators, called "werewolves", to take hostages, commit arson, and rob banks. One of the two authors of the pamphlet, which was published anonymously, was the Hamburg neo-Nazi Henry Fiebig.