Judy Brown, president of American Life League, has some choice words to say about the mess that John Marrella et al have made of the credibility of the Knights of Columbus.
I echo Judy's suggestion that what is needed is a mass exodus in protest. Rip up your cards publicly. Barring that, you might try not paying your dues in protest. Then when the brass threatens you with expulsion, point out the irony of them allowing fomenters of baby-murder to prowl their halls while driving decent Catholic men away.