Henri Polak was educated at the private Jewish 'school of master Halberstadt'. He resided in London for a few years and then became a committee member of the Dutch Association of Diamond Workers in Amsterdam.
After an all-out strike of diamond workers, the General Dutch Union of Diamond Workers (Algemeene Nederlandse Diamantbewerkers Bond - ANDB) was set up on 18 November 1894 in Café Centraal. H…