There have also been actions carried out by right-wing extremists where covert NF involvement was suspected but not proven. For instance, in February 1974, several men put up NF posters in Brighton, assaulted passers by whom they accused of being Jewish, and attacked staff at the Communist Party of Britain (Marxist-Leninist) bookshop. The local NF branch denied knowledge of the incident or the individuals in question. In June 1978, the Anti-Nazi League headquarters was hit by an arson attack; the slogan "NF Rules OK" was graffitied on the building. Again, the NF denied responsibility. The party's leadership showed little concern with the violent activities of such members and supporters, and openly praised some of its members convicted of violent criminal activity. The National Front has been cited as one of the leading causes for racist violence against black and Asian communities (labeled as "Paki-bashing") in Britain during the late 1960s to late 1970s.