#70425, Placards, including one showing Harold Wilson, the British Prime Minister at the time, at the anti-Vietnam war demonstration from Trafalgar Sq to Grosvenor Square, Sunday 17th March 1968. The Vietcong flag is held aloft. A banner says "Victory to the NLF". The Vietcong (National Liberation Army, NLF) was a political organisation and guerrilla army in South Vietnam which fought the Americans.