Hundreds of leaked intelligence reports shed light on a shadow war for regional influence — and the battles within the Islamic Republic’s own spy divisions. In mid-October, with unrest swirling in Baghdad, a familiar visitor slipped quietly into the Iraqi capital. The city had been under siege for weeks, as protesters marched in the streets, demanding an end to corruption and calling for the ouster of the prime minister, Adil Abdul Mahdi. In particular, they denounced the outsize influence of their neighbor Iran in Iraqi politics, burning Iranian flags and attacking an Iranian consulate. The visitor was there to restore order, but his presence highlighted the protesters’ biggest grievance: he was Maj. Gen. Qassim Suleimani, head of Iran’s powerful Quds Force, and he had come to persuade an ally in the Iraqi Parliament to help the prime minister hold onto his job. It was not the first time General Suleimani had been dispatched to Baghdad to do damage control. Tehran’s efforts to prop up Mr. Mahdi are part of its long campaign to maintain Iraq as a pliable client state. Now leaked Iranian documents offer a detailed portrait of just how aggressively Tehran has worked to embed itself into Iraqi affairs, and of the unique role of General Suleimani. The documents are contained in an archive of secret Iranian intelligence cables obtained by The Intercept and shared with The New York Times for this article, which is being published simultaneously by both news organizations. The unprecedented leak exposes Tehran’s vast influence in Iraq, detailing years of painstaking work by Iranian spies to co-opt the country’s leaders, pay Iraqi agents working for the Americans to switch sides and infiltrate every aspect of Iraq’s political, economic and religious life. Many of the cables describe real-life espionage capers that feel torn from the pages of a spy thriller. Meetings are arranged in dark alleyways and shopping malls or under the cover of a hunting excursion or a birthday party. Informants lurk at the Baghdad airport, snapping pictures of American soldiers and keeping tabs on coalition military flights. Agents drive meandering routes to meetings to evade surveillance. Sources are plied with gifts of pistachios, cologne and saffron. Iraqi officials, if necessary, are offered bribes. The archive even contains expense reports from intelligence ministry officers in Iraq, including one totaling 87.5 euros spent on gifts for a Kurdish commander. According to one of the leaked Iranian intelligence cables, Mr. Mahdi, who in exile worked closely with Iran while Saddam Hussein was in power in Iraq, had a “special relationship with the I.R.I.” — the Islamic Republic of Iran — when he was Iraq’s oil minister in 2014. The exact nature of that relationship is not detailed in the cable, and, as one former senior U.S. official cautioned, a “special relationship could mean a lot of things — it doesn’t mean he is an agent of the Iranian government.” But no Iraqi politician can become prime minister without Iran’s blessing, and Mr. Mahdi, when he secured the premiership in 2018, was seen as a compromise candidate acceptable to both Iran and the United States. The leaked cables offer an extraordinary glimpse inside the secretive Iranian regime. They also detail the extent to which Iraq has fallen under Iranian influence since the American invasion in 2003, which transformed Iraq into a gateway for Iranian power, connecting the Islamic Republic’s geography of dominance from the shores of the Persian Gulf to the Mediterranean Sea. The trove of leaked Iranian intelligence reports largely confirms what was already known about Iran’s firm grip on Iraqi politics. But the reports reveal far more than was previously understood about the extent to which Iran and the United States have used Iraq as a staging area for their spy games. They also shed new light on the complex internal politics of the Iranian government, where competing factions are grappling with many of the same challenges faced by American occupying forces as they struggled to stabilize Iraq after the United States invasion. And the documents show how Iran, at nearly every turn, has outmaneuvered the United States in the contest for influence. The archive is made up of hundreds of reports and cables written mainly in 2014 and 2015 by officers of Iran’s Ministry of Intelligence and Security, or M.O.I.S., who were serving in the field in Iraq. The intelligence ministry, Iran’s version of the C.I.A., has a reputation as an analytical and professional agency, but it is overshadowed and often overruled by its more ideological counterpart, the Intelligence Organization of the Islamic Revolutionary Guard Corps, which was formally established as an independent entity in 2009 at the order of Iran’s supreme leader, Ayatollah Ali Khamenei. In Iraq, Lebanon and Syria, which Iran considers crucial to its national security, the Revolutionary Guards — and in particular its elite Quds Force, led by General Suleimani — determines Iran’s policies. Ambassadors to those countries are appointed from the senior ranks of the Revolutionary Guards, not the foreign ministry, which oversees the intelligence ministry, according to several advisers to current and past Iranian administrations. Officers from the intelligence ministry and from the Revolutionary Guards in Iraq worked parallel to one another, said these sources. They reported their findings back to their respective headquarters in Tehran, which in turn organized them into reports for the Supreme Council of National Security. Cultivating Iraqi officials was a key part of their job, and it was made easier by the alliances many Iraqi leaders forged with Iran when they belonged to opposition groups fighting Saddam Hussein. Many of Iraq’s foremost political, military, and security officials have had secret relationships with Tehran, according to the documents. The same 2014 cable that described Mr. Mahdi’s “special relationship” also named several other key members of the cabinet of former Prime Minister Haider al-Abadi as having close ties with Iran. A political analyst and adviser on Iraq to Iran’s government, Gheis Ghoreishi, confirmed that Iran has focused on cultivating high-level officials in Iraq. “We have a good number of allies among Iraqi leaders who we can trust with our eyes closed,” he said. Three Iranian officials were asked to comment for this article, in queries that described the existence of the leaked cables and reports. Alireza Miryusefi, a spokesman for Iran’s United Nations mission, said he was away until later this month. Majid Takht-Ravanchi, Iran’s United Nations ambassador, did not respond to a written request that was hand-delivered to his official residence. Foreign Minister Mohammad Javad Zarif did not respond to an emailed request. When reached by telephone, Hassan Danaiefar, Iran’s ambassador to Iraq from 2010 to 2017 and a former deputy commander of the Revolutionary Guards’ naval forces, declined to directly address the existence of the cables or their release, but he did suggest that Iran had the upper hand in information gathering in Iraq. “Yes, we have a lot of information from Iraq on multiple issues, especially about what America was doing there,” he said. “There is a wide gap between the reality and perception of U.S. actions in Iraq. I have many stories to tell.” He declined to elaborate. According to the reports, after the American troop withdrawal in 2011, Iran moved quickly to add former C.I.A. informants to its payroll. One undated section of an intelligence ministry cable shows that Iran began the process of recruiting a spy inside the State Department. It is unclear what came of the recruitment effort, but according to the files, Iran had started meeting with the source, and offered to reward the potential asset with a salary, gold coins and other gifts. The State Department official is not named in the cable, but the person is described as someone who would be able to provide “intelligence insights into the U.S. government’s plans in Iraq, whether it is for dealing with ISIS or any other covert operations.” “The subject’s incentive in collaborating will be financial,” the report said. The State Department declined to comment on the matter. N.Y Times