Protests against the Vietnam War took many forms. But the most sanguine approach to solidarity work was surely that adopted by the Medical Aid Committee for Vietnam (MACV). In 1967, activists in London organised a blood donor session, collecting 56 pints with the help of workers from the blood transfusion service. Further donor sessions were organised, and the MACV developed a system for safely storing the blood and delivering it to LOT, the Polish airline, which flew it to Berlin to be processed into dried plasma which could be sent on to Hanoi in North Vietnam or Phnom Penh in Cambodia. By the time the sessions ended in 1971, more than 6,000 pints had been collected and processed. The story is told on the Frontline States website, which also has information on MACV itself and on art exhibitions held between 1968 and 1982 to raise funds for the campaign. MACV’s successor organisation, Medical and Scientific Aid for Vietnam, Laos and Cambodia continues its work today.