 The largest single trade union is the IG Metall, which organizes about 2.3 million members in metal (including automobile and machine building), electronics, steel, textile, wood and synthetics industries.The German Federation of Trade Unions ("Deutscher Gewerkschaftsbund" (DGB)) is the largest umbrella organization of unions in Germany.The eight different unions that belong to it cover many sectors of German industry, public services such as police, and higher and professional education.