Olympic memorabilia featuring and signed by Farah has also been auctioned off to raise funds for the London Organising Committee of the Olympic and Paralympic Games (LOCOG). In 2013, he joined legislators and activists in a campaign urging Barclays Bank to repeal its decision to withdraw from the UK remittance market. Farah often used money transfer operators to send remittances to family, and some of the world's largest organisations and charities, including the UN and his own foundation, likewise paid staff and channelled funds through these services. In March 2013, Farah, singer Robbie Williams, and a number of other celebrities also urged Chancellor George Osborne to clamp down on global corporations that avoid paying taxes in poor countries in which they operate. He has also expressed support for research into brain tumours.