MI5 first picked out the seventeen year old Communist Party member, Ewan MacColl (then Jimmy Miller), due to his role in the organisation of the 1932 Kinder Mass Trespass; a direct action stunt in which nine thousand radical ramblers asserted their right to walk in the British countryside. Ewan MacColl owned a knitted bobble hat which has been on display with some of his prized posessions. Bobble hats have since become a symbol of the rambling movement, a movement which celebrates the fight for access by the common people to some of the country's most beautiful countryside.