A boycott, supporters say, would aim to use consumer power to pressure Starbucks to stop its union-busting and illegal actions and to finally negotiate its first union contract.

The union has scheduled a nationwide Day of Action on 14 September to urge “customers and allies to join the fight” to get Starbucks to “respect workers’ fundamental right to organize and bargain a fair contract”.

Ganz said the grape boycott succeeded because not just farm workers backed it, but because “it was students, civil rights groups, churches, labor unions.

The former labor secretary Robert Reich, who is a Guardian columnist, said: “Until Starbucks enters into good-faith negotiations with its unionized employees – and ceases its union-busting efforts – we consumers must stop enabling this anti-worker, anti-union behavior.

Some labor experts say Starbucks is the country’s most notorious union buster since JP Stevens, a major textile company that mounted a fierce anti-union campaign in the 1960s and 1970s that included widespread illegalities.

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