I'm an anarchist and am tempted to helpfully send them 'any information about anarchists' as requested. Potted biographies of Bakunin, Proudhon, Stirner, and of course Kropotkin for starters. And then perhaps a historic overview of the debate about means and methods that anarchists have engaged in with each other from the C18th to now. Oh, and there have been some pretty vigorous debates about Bakunin, Lenin, the International and all that. Ooh, and information about troop movements around the Kronstadt rebellion, and stats about industrial output in Catalonia around 1936. Hmm - come to think of it, what I have for lunch every day clearly falls under their definition.

One seeks to be helpful where one can be without compromising one's principles.