TIM HORTONS, Canada's largest coffee-and-doughnut chain, is so beloved that politicians campaigning for office rarely fail to visit one. Its "double-double", a coffee with two splashes of cream and two sugars, has an entry in the Canadian Oxford Dictionary. But in January trade-union activists held demonstrations outside Tim Hortons restaurants in Ontario, the country's most populous province. Those have died down, but angry letters and phone calls keep coming.
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