In fact, attempts to copy the GEMA deal at other factories have been quashed.

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At GEMA the break time is cut in half, to two 12-minute breaks per day.

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The biggest obstacle, however, is that around many union halls, GEMA is a dirty word.

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"GEMA went way too far, " complains Jerry Sullivan, president of Local 600, which represents 8, 000 workers at Ford's historic Rouge manufacturing complex.

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Samba clubs have come and gone, but one of Lapa's mainstays is Carioca da Gema, a pioneer among music bars to the area when it opened back in 2000.

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Even more remarkable, half the workers don't even work directly for GEMA. They're employed by some 18 contractors doing noncore jobs once jealously guarded by the UAW, like moving supplies, maintaining equipment or cleaning the factory.

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He's a leader in helping Ford wring out waste and simplify work rules to boost productivity. (Many Ford plants, in fact, are adopting four-day workweeks, fewer job classifications and lower pay for janitors, just like GEMA.) But Sullivan objects to how few jobs at GEMA are left for UAW workers earning top-tier wages.

FORBES: Labor Riddle