VIENNA — Pakistani scientist Abdul Qadeer Khan presided over a nuclear smuggling operation so brazen that the government weapons laboratory he ran distributed a glossy sales brochure offering sophisticated technology and shipped some of its most sensitive equipment directly from Pakistan to countries such as Libya and North Korea. The brochure, with photos of Khan and an array of weapons on the cover, listed a complete range of equipment for separating nuclear fuel from uranium. Also for sale were Khan's "consultancy and advisory services," and conventional weapons such as missiles, according to a copy of the brochure provided to the...