 In addition to causing about two @-@ thirds of its members to quit between 1906 and 1910 , the radicalization of the FVdG also correlates to a slight change in the milieu , industries , and regions from which the organization drew its members . Many metal and construction workers , who had a localist tradition , left as a result of the syndicalist and anarchist tendencies in the FVdG . Miners , who worked mostly in the Ruhr area , did not have this tradition but developed a certain skepticism of bureaucratic structures . About 450 of them joined the FVdG before World War I , a sign of what was to come after the war . 
