 The localists ' main stronghold was in Berlin , although localist unions existed in the rest of the Empire as well . Masons , carpenters , and some metal @-@ working professions — especially those requiring a higher degree of qualification like coppersmiths or gold and silver workers — were represented in large numbers . By 1891 , there were at least 20 @,@ 000 metal workers in localist trade unions , just as many as in the centralized German Metal Workers ' Union . 
