(NEWSER) – First Sam Adams and Heineken quit sponsoring St. Patrick's Day parades in Boston and New York City; now Guinness is joining in protest of a ban on gay activist groups marching in the celebrations, Reuters reports. "Guinness has a strong history of supporting diversity and being an advocate for equality for all. We were hopeful that the policy of exclusion would be reversed for this year's parade," the company says. "As this has not come to pass, Guinness has withdrawn its participation."Fox News notes that Ford Motor Company is now the only big US sponsor of today's parade.