Employees and union officials from Cadbury's chocolate factory at Keynsham have been out campaigning and urging people to boycott the firm's products.
The factory will finally close in 2010 with production moving to Poland
The small demonstration was held outside Asda, Longwell Green, to get the protest message across.
Earlier this week it was confirmed plans to shut the factory and move production to Poland would go ahead.
A Cadbury's spokesman said it was disappointed a few individuals had called for the boycott.
'Sensitivity and understanding'
He added: "We appreciate feelings are running high after the announcement.
"We will treat all employees with sensitivity and understanding as we move to closure by 2010.
"But there will be no reduction in head count at the [Keynsham] factory during 2008."
Around a dozen protesters waved placards outside the store on Saturday.
Unite spokeswoman Lydia Hayes said it was important shoppers knew about the product boycott.
She said: "We are here to make sure people know about it and are asking shoppers not to buy Cadbury's chocolate."