Here's an article from 1952 about a mooted punters' union in Australia: http://trove.nla.gov.au/ndp/del/article/23198157

One actually got off the ground in the UK, for a time: http://www.independent.co.uk/sport/...ot-1282364.html

A group called the Horseracing Bettors Forum (comprising 8 "punters") is now a consultative body of the British Horseracing Association, since late last year: http://www.britishhorseracing.com/b...-bettors-forum/