Campaign Groups Take Part In A May Day March

LONDON, ENGLAND - MAY 01: Anti-capitalist protesters from the 'Occupy' movement attend a protest through the centre of London to mark May Day on May 1, 2012 in London, England. Students, trade unionists, pensioners and activists from the anti-capitalist 'Occupy' movement marched through the centre of London before congregating and staging a demonstration in Trafalgar Square to mark May Day. (Photo by Oli Scarff/Getty Images)