 The Representatives ' Centralization 's relationship to the SPD was ambivalent . The organization was allied with the SPD and supported the Erfurt Program . At the same time , the party mostly opposed the founding of the Representatives ' Centralization and called upon its members to rejoin the centralized trade unions . The FVdG remained affiliated with the SPD , which in turn tolerated it because the SPD was afraid a split would lead to a large loss of members . The FVdG stated it would rejoin the centralized trade unions like the SPD leadership desired only if the centralized unions accepted the FVdG 's organizational principles . 
