The Irish Militant of September 1966 reported on a march of the Irish Trade Union Defence Committee to the Irish embassy in London. Among the banners listed as present were those of anarchists, and the chair of the rally was Mike Walsh of the London Federation of Anarchists.
The photograph shows Saor Eire activist Frank Keane carrying the Irish tricolour and Dublin republican Eamonn Nolan carrying the Starry Plough. Behind Keane is Butch Roche who threw a canister of CS gas into the House of Commons in 1970, after the British army had fired thousands of rounds of CS into the Bogside area of Derry, and the Lower Falls in Belfast.
This paper was published by the Irish Workers Group, a 1960s London-based group of Irish emigrants, which brought together disaffected left republicans and Trotskyists.
Members of the IWG later influential in the Irish left include SWP member and Derry MLA Eamonn McCann, and former Peoples Democracy leader Michael Farrell. Paddy and Seamus Healy were also involved, later setting up the League for a Workers Republic in Ireland. Today Seamus is an independent TD for Tipperary.
You can find copies of the Irish Militant at Red Mole Rising
and more information about Saor Eire at the Irish Republican & Marxist History Project