Christopher Hitchens said this quote
“ Not long ago, having expressed some disagreements in print with an old comrade of long standing, I was sent a response that he had published in an obscure newspaper. This riposte referred to my opinions as ‘racist.’ I would obviously scorn to deny such an allegation on my own behalf. I would, rather, prefer to repudiate it on behalf of my former friend. He had known me for many years and cooperated with me on numerous projects, and I am quite confident that he would never have as a collaborator anyone he suspected of racial prejudice. But it does remind me, and not for the first time, that quarrels on the left have a tendency to become miniature treason trials, replete with all kinds of denunciation. There's a general tendency—not by any means confined to radicals but in some way specially associated with them—to believe that once the lowest motive for a dissenting position has been found, it must in some way be the real one. ”