There have been plenty of real life conspiracies with really solid evidence trails, convictions and confessions. The CT community seems less interested in these, maybe because they have elements of falsifiability, but the fact is these already exposed conspiracies don't die. The players just move around.
As is well known, in the middle 1980s, as the Cold War was tapering off, the US found itself dealing with new adversaries in the middle east, specifically in Iran, Iraq, and Lebanon. Simultaneously, the government was trying to suppress any vestiges of communism left in the Western hemisphere. Trying to solve both of these problems neatly led to the Iran/Contra affair where the Reagan administration sold weapons to Israel as a conduit to sell them to supposed "moderates" in Iran. Because Iran was sanctioned by the US at the time following the rise of Khomeini and the taking of hostages in 1979, a direct sale was illegal. Reagan's stated aim was to use the arms deal to get Iran to influence Hezbollah in Lebanon to release American hostages.
Of course, money from the sale was diverted into a few side projects, one being supplying the Mujahadeen in their fight against the Soviets in Afghanistan and the other being to topple the regime in Nicaragua by arming the paramilitary band of terrorists known as the Contras. This was also illegal due to an amendment to a bill passed in Congress saying the administration couldn't provide support to the Contras without Congressional approval. The scheme was exposed due to a series of blunders. Ollie North and about a dozen others were convicted, including an Assistant Secretary of State who will appear later in this story.
When George HW Bush took office, he pardoned everyone who had been convicted who hadn't already gotten off. Both he and Reagan had been insulated from the scandal though North had destroyed hundreds of pages of documents, so it's anyone's guess what was in them. Interestingly, one of North's big ideas was the removal of Saddam Hussein, which HW Bush would stop short of during the Persian Gulf War, but did welcome. He believed the advice of other nations in the region which assured him Saddam would fall on his own, but he of course didn't.
To return to Iran/Contra and its many tentacles, one of the go betweens to the deal was a wealthy businessman and arms dealer named Adnan. He was the son of the personal physician of Abdul Aziz al Saud, the first king of the modern state of Saudi Arabia. As such, he wielded a great deal of influence and was well connected to be part of the complex plot. A couple years later, he was brought up on charges for laundering alongside Imelda Marcos who had absconded from the Philippines with hundreds of millions of dollars she and her husband had purloined. Adnan had helped move the money around. At one time, he owned the world's biggest yacht, but sold it to the Sultan of Brunei (who also played a brief role in the Iran/Contra affair when money was accidentally wired to someone and it was transferred to him). The Sultan sold it to a real estate tycoon by the name of Donald J. Trump, who held onto it for a bit before selling it to a member of the Saudi royal family to pay off debts.
Adnan had two nephews who now enter our story. One was a young socialite who died tragically while purportedly fleeing the paparazzi in a car accident with his girlfriend, Princess Diana. His name was Dodi al Fayed. The other nephew had been a friend of a young Osama bin Laden before he joined the Salafists and left to fight alongside the Mujahadeen as they used US supplied arms to fight the flagging Soviet empire. He would go on to become a dissident journalist who was deeply critical of the Saudi regime, of Salafists, and of autocrats throughout the region. His name was Jamal Khashoggi and he was murdered in the Saudi embassy in his family's ancestral homeland of Turkey just over a year after his uncle Adnan had died of Parkinson's in England.
Meanwhile, back in the US, we return to that Assistant Secretary of State who was pardoned and discover he's none other than Elliot Abrams, who has of course lately been named the Trump Administration's special representative for Venezuela which is in the midst of an attempted regime change project. Ollie North is of course head of the NRA, which controls a lot of lobbying dollars that influence congress members. And who pray tell was the Attorney General who prepped and vigorously endorsed the pardons of North, Abrams and the rest? None other than our new Attorney General, William Barr.