The UK's proscription of Palestine Action as a terrorist organisation has produced a consequence the law's architects likely never stress-tested: the withdrawal of Sally Rooney's books from sale across the country. Rooney's publisher, Faber & Faber, pulled the titles not because of their content, but because paying royalties to an author who publicly supports a proscribed group could constitute a criminal offence under anti-terror financing rules. The mechanism is indirect but effective — the law doesn't ban the books; it makes it illegal to pay the person who wrote them. The response has been substantial. An open letter on the cover of the New Statesman, signed by Paul Mescal, Susan Sarandon, Tilda Swinton, Gary Lineker, Arundhati Roy, Naomi Klein, JM Coetzee, Zadie Smith, William Dalrymple, Jonathan Glazer, Slavoj Žižek, Kate Nash, and Kneecap, calls the situation a "repressive absurdity" and an "affront to basic principles of free speech." The signatories read like a roll call of contemporary Anglophone and international cultural authority, and their collective weight is clearly intended to reframe this from a niche legal dispute into a first-order free expression crisis. Rooney herself has been characteristically direct. She has said further publication of her work could constitute a "serious criminal offence," that she made "every effort to be honest" about her beliefs, and that she is "wholly prepared to accept the consequences." This is not a case of an author being silenced against her will — it is a case where the law's architecture makes it impossible for a willing publisher and a willing author to transact, because the payment pipeline itself is criminalised. Faber & Faber's statement is revealing in its precision. The publisher described an "unconscionable situation" where it "cannot pass on UK earnings to Sally Rooney for her work." E-books have also been removed, though some physical copies remain on shelves — a detail that exposes the absurdity of enforcement: the same book is simultaneously available and banned depending on format and inventory. The timing is significant. The UK Supreme Court is set to hear a case on the Palestine Action proscription in two weeks. The open letter is clearly timed to shape the political and public atmosphere around that hearing. Whether the court addresses the downstream censorship effects of proscription — as opposed to the narrower question of whether Palestine Action's ban was lawful — will determine whether this remains a one-off embarrassment or sets a durable precedent. The structural problem extends well beyond Rooney. The proscription regime was designed to cut off funding to organisations engaged in violence. Applied to an author whose connection is rhetorical support rather than operational involvement, it converts anti-terror law into a content-neutral financial blockade that functions as censorship. Any author, musician, or public figure who expresses support for a proscribed group could face the same publisher withdrawal — not as punishment for speech, but as a compliance side-effect. Rooney has sold more than six million books globally. Her four novels are best-sellers. The UK market is losing access to one of its most commercially significant literary figures not because of a court order targeting her work, but because the financial plumbing of anti-terror law has no valve for distinguishing rhetorical solidarity from operational support. That is the design flaw this episode exposes, and it will not fix itself.