The movement espouses a number of approaches, and is bitterly divided on the issue of direct action and violence, with very few activists or writers publicly advocating the latter tactic as a justified method to use. Most groups reject violence against persons, intimidation, threats, and the destruction of property: for example, the British Union for the Abolition of Vivisection (BUAV) and Animal Aid. These groups concentrate on education and research, including carrying out undercover investigations of animal-testing facilities. There is some evidence of cooperation between the BUAV and the ALF: for example, the BUAV used to donate office space for the use of the ALF in London in the early 1980s.