The article is on JSTOR. It's Caillois relating what Bataille told him and others, there are no sources. Here's the relevant bit:

he hardly concealed his intention to re-create a virulent and devastating sacré, a rite which would end in an epidemic contagion, converting and exalting the person who had sown its first seed. At one of our private reunions he revealed his plan to Alexander Kojevnikov (who later shortened his name to Kojeve). The latter replied that such a miracle-worker was no more likely to be inspired by a sacré which he had consciously triggered, than a conjurer could persuade himself of the existence of magic by marvelling at this own sleight-of-hand. I was convinced of this. But Bataille, who had the amazing ability to get angry whenever he chose, paid no attention. What is more, he was not revealing everything. To provide the initial kindling for the irresistible expansion of the sacred, he was planning an irrevocable ritual gesture --the enactment, as he confided to me later, of a voluntary human sacrifice. He already had the victim, and had obtained (or had undertaken to obtain) a certificate destined for the authorities which cleared the murderer in advance. Such cunning, however, useful, was ill-suited to the savage explosion of the sacred which was to revitalize a torpid society. I re-examined Kojevnikov's objection and became even more reluctant. More from incredulity than because I had given him my word, I kept Bataille's secret, at least until the publication in New York, during the war, of indiscretions which had to be rectified. Nonetheless Georges Bataille pursued his personal projects to the heart of a sort of initiatory society whose name, Acephale, said enough about its anti-intellectual, if not to say, visceral inclinations. But curiously, he never gave up trying to reconcile this group with the very cerebral Collège de sociologie. He strained his ingenuity to find activities in which the groups could participate together, such as the celebration of the execution of Louis XVI on the anniversary of the event at the presumed spot of the scaffold (Place de la Concorde). I note these details as characteristic of the atmosphere of that time. The war swept away all these fleeting impulses, but in fact the return of peace caused an abatement of the fever in which they had flourished.