In the early 1990s, a paramilitary group known as Combat 18 (C18) was formed to protect BNP events from anti-fascist protesters. Tyndall was displeased that by 1992, C18 was having an increased influence over the BNP's street activities. Relations between the groups deteriorated such that by August 1993, activists from the BNP and C18 were physically fighting each other. In December 1993, Tyndall issued a bulletin to BNP branches declaring C18 to be a proscribed organisation, furthermore suggesting that it may have been established by agents of the state to discredit the party. To counter C18's influence, he secured the American white nationalist militant William Pierce as a guest speaker at the BNP's annual rally in November 1995.