Bill Donohue, president of the socially conservative Catholic League, is calling on Catholics to boycott three beer companies that pulled their sponsorships of two St. Patrick's Day parades.

Guinness on Sunday joined Heineken in withdrawing its support for New York City's parade, while Sam Adams pulled its sponsorship of Boston's parade.

(Related: Guinness withdraws support from New York City's St. Pat's Day parade over anti-gay policy.)

Both parades refuse to allow gay organizations to participate.

“None of these companies believe in diversity. No gay person has ever been barred from marching in any St. Patrick's Day parade, anymore than the parade bans pro-life Catholics or vegetarian Catholics; they simply cannot march under their own banner. The parade has one cause: honoring St. Patrick. Those who disagree do not have to march--that's what diversity is all about.”

“The parade is quintessentially Catholic, beginning with a Mass in St. Patrick's Cathedral. It is this Catholic element that angers those who are engaged in a bullying campaign against the St. Patrick's Day parades. The bullies also have nothing but contempt for the constitutional rights of Irish Catholics.”

“In 1995, the U.S. Supreme Court ruled in a 9-0 decision that the First Amendment guarantees the right of private parade organizers to determine its own rules for marching. It is this liberty that the makers of Guinness, Heineken, and Sam Adams want to squash.”

“I have had my last Guinness and Sam Adams. Heineken was always slop, so there is no sacrifice there. I urge Catholics, and all those who believe in tolerance, diversity, and the First Amendment, to join with me in boycotting these brews.”

(Related: Unhappy over Guinness' pro-gay stance, Rupert Murdoch calls for boycott.)