American communists are not sitting on the sidelines in the left’s attacks on Indiana over gay marriage. Hardly. They are condemning Indiana because they are firmly on board for gay marriage – for a host of interesting reasons. Communists have steadily but surely moved in this direction, a literal two-century-long progression I chronicle in my coming book, “Takedown: From Communists to Progressives, How the Left Has Sabotaged Family and Marriage.” Once upon a time, the Communist Party USA booted out gays like Harry Hay, founder of the Mattachine Society, and the likes of Fidel Castro (who, amazingly, is reportedly also now an advocate of gay marriage) once tossed homosexuals in insane asylums. Not anymore. There has been a fundamental transformation.

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Why would this be? When did it happen? There are many reasons, which I chronicle in my coming book, but among them, the most significant (if not chilling) is this: For two centuries, communists and other leftist radicals have been seeking to take down natural-traditional-biblical marriage and the family. Since the early 1800s, they have made their arguments and tried different tactics. The Communist Manifesto spoke of “abolition of the family.” At long last, however, communists have the vehicle to make it happen: gay marriage – a 21st-century novelty utterly without precedent in human history. Now, as the legal definition of marriage rapidly changes, the floodgates will be open to all sorts of new configurations.

Their efforts to redefine the family structure have been long at work, starting with Karl Marx and Friedrich Engels and moving on to the Bolsheviks, to cultural Marxists from the Frankfurt School such as Herbert Marcuse and Wilhelm Reich, and on to more modern Marxists such as Betty Friedan, Kate Millett and assorted ’60s radicals. Those leftist extremists, however, never made much headway in their efforts to redefine family and marriage. Only now, with formal legalization of same-sex marriage afoot, they are finally getting what they’ve wanted for multiple generations: the literal redefinition of family.

To be sure, Marx and Engels would be speechless at the idea of two men marrying each other. They would be equally baffled that mainstream Americans now gladly join them in rejecting the biblical design for natural marriage and family. Nonetheless, this is where the culture now stands.

And perhaps most fascinating of all, communists then and today would be shocked but delighted to find that gay marriage has provided them a stunningly effective tool in attacking what the far left has always hated most: religion. Marx and Engels and friends would be absolutely thrilled that gay marriage is offering a sledgehammer not only to remold the family but to bludgeon religious believers. It’s an amazing sight to behold. It has been a long time coming.