“Did I help fix an election? Yes.” Or so claims foreign lobbyist Robert Stryk in “Devils’ Advocates: The Hidden Story of Rudy Giuliani, Hunter Biden, and the Washington Insiders on the Payrolls of Corrupt Foreign Interests,” a new book by New York Times reporter Kenneth Vogel about the inner workings of American lobbyists working for foreign governments. In Stryk’s telling, he paved the way for the first Trump administration to accept a power sharing agreement for then-DRC Preside...