A leaked phone call between an Israeli intelligence operative and a senior Iranian police commander is offering a rare—and striking—glimpse into growing cracks in Iran’s security apparatus as the U.S.-Israel campaign continues. In the call, first reported by The Wall Street Journal, a Mossad agent warns the commander that he is “on our blacklist” and urges him to stand aside in the event of a popular uprising against the regime. “We know everything about you,” the agent says in Farsi. “If you will not stand with your people, your destiny will be as your leader.” The response is startling. “Brother,...