"the colours of the SDF"
Local election pamphlet of the SDF (1896)
Public DomainLocal election pamphlet of the SDF (1896) - Credit: SDF

The Social Democratic Federation was Britain's first organised socialist political party.

It was founded by H.M. Hyndman in 1881 and counted Eleanor Marx, Edward Aveling and William Morris amongst its earliest members.

It is not clear what colours represented the SDF; red is the colour usually associated with communism and left-wing socialism.

 

Red flag: a symbol of communism and socialism
GNU Free Documentation LicenseRed flag: a symbol of communism and socialism - Credit: Ssolbergj, Wikimedia Commons