The lambda was selected as a symbol by the Gay Activists Alliance of New York in 1970, following the Stonewall Riots, and was declared the international symbol for gay and lesbian rights by the International Gay Rights Congress in Edinburgh, Scotland, in 1974. The lambda signifies unity under oppression.
The Scottish Minorities Group hosted the first ever International Gay Rights Conference in Edinburgh from 18 to 22 December 1974. It was co-organised by Ian Dunn and Derek Ogg. Ian Dunn had organised the first meeting of what was to become the Scottish Minorities Group in 1969. Derek Ogg