The United Food and Commercial Workers Union, which represents around 70,000 grocery workers involved in a labour dispute in southern California, has said it plans to stake a rally on Wall Street, targeting investors in three grocery retail companies.

The union wants to encourage people to think twice about investing in Albertsons, Kroger and Safeway, the three US retailers at the centre of the near four-month long dispute that centres on health care costs.

“We want to educate the people who buy and sell stock from these companies about what they are doing to their employees,” Ellen Anreder, a spokeswoman for the UFCW, was quoted by Reuters as saying.