“You don’t have to read the People’s Daily, because that won’t tell you what’s really going on, but you have to read these,” said Ho Pin, an exiled Chinese journalist who runs Mirror Books, a company based in New York that publishes muckraking books and magazines in Chinese. Chinese officials visiting Hong Kong often buy them as gifts for fellow officials, he said. “In the past, you’d give a mayor a bottle of liquor. But that’s nothing these days, and so is a carton of cigarettes,” Mr. Ho said. “But if you give him one of our books or magazines, he’ll be very happy.”