Commentary The American Booksellers Association (ABA) is a trade organization for America’s dwindling number of independent, non-chain bookstores. Those community-based stores “serve a unique role in promoting the open exchange of ideas” the ABA’s website declares. Unless, it would seem, the “ideas” are deemed objectionable by the progressive powers that be. Then, the ABA switches from promoter of “open exchange” to iron-fisted censor worthy of the 17th-century Puritans who banned all books that criticized their Massachusetts theocracy. Nor is the ABA alone as an organization ostensibly devoted to the values of free speech and a free press exemplified in the Constitution’s First Amendment, but in actuality an enforcer of canceling whatever products of speech and press are ruled out of bounds by a left-leaning cultural establishment. Publishers and librarians—who also pay lip service to the First Amendment and its values—have been almost as craven. Case in point: the ABA’s treatment …