Empire of Pain: The Secret History of the Sackler Family by Patrick Radden Keefe:
Shortly after Rudolph Giuliani stepped down from his position as mayor of New York City, he went into business as a consultant, and one of his first clients was Purdue. When he entered the private sector, Giuliani was looking to make a lot of money quickly. In 2001, he had a net worth of $1 million; five years later, he would report $17 million in income and some $50 million in assets. For Purdue, which was working hard to frame OxyContin abuse as a law enforcement problem, rather than an issue that might implicate the drug itself or the way it was marketed, the former prosecutor who had led New York City after the 9/ 11 attacks would make an ideal fixer. In Michael Friedman’s view, Giuliani was “uniquely qualified” to help the company.
“Government officials are more comfortable knowing that Giuliani is advising Purdue,” Udell pointed out. Giuliani, he maintained, “would not take an assignment with a company that he felt was acting in an improper way.”