RADICAL HEROES - INTERNATIONAL BRIGADERS

As noted HERE, just as the Spanish Civil War was "winding down", the Very British Civil War was "heating up". In late 1938, the "International Brigades", then fighting for the Spanish Republic, were disbanded and withdrawn (in a futile attempt by the then President of the Republic, Juan Negrin, to make an end to all foreign intervention in the conflict, and win the support of the British and French Governments). This meant that a lot of British Radicals (in significant part, Communists), experienced in the ways of civil war, then returned to the UK - with consequences well known to all VBCW historians.

In any event, the British Contingent of the International Brigades has been well (indeed, exhaustively) documented - down to the personal histories of each individual fighting with the "British Battalion". THIS PAGE HERE gives wonderful detail of the kind of personalities who were willing to fight, and if necessary, die, for the "Anti-Fascist cause" in the late 1930s:

A posthumous Communist salute from Charles Goodfellow, a Scottish miner
and member of the CPGB from 1921. Killed by shrapnel to the head on Mosquito Ridge,
 Battle of Brunete. He arrived in Spain on 22nd December 1936. MORE HERE

Although consistently describing themselves simply as "Anti Fascists", the International Brigades were in large part organised and financed by the Comintern and, at the Comintern's orders, European Communist Parties. Harry Pollitt, the General Secretary of the Communist Party of Great Britain, did his bit from 16, King Street, the CPGB HQ, and visited the British Battalion in Spain:

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British Battalion LtoR - Walter Tapsell with pipe, William Paynter, Fred Copeman, 

Harry Pollitt, George Aitken, George Brown, Bert Williams.

28mm International Brigade from North Star Figures (Crusader). It's not clear whether
these are still available, or have now gone OOP - enquiries to North Star.
Nobody (as yet) seems to make a 28mm "Harry Pollitt" figure.

All you need to complete an "International Brigade" force for the VBCW
 - a generic International Brigade Flag.