"For about ten years, Sater worked continuously with prosecutors and law enforcement agents to provide information that is crucial to the conviction of over 20 different individuals, including those responsible for committing massive financial fraud, members of La Cosa Nostra's organized crime families, and international cybercriminals, "prosecutors wrote to a federal judge 10 years ago. "Additionally, Sater provided the US intelligence environment with very sensitive information in an effort to help the government fight terrorists and rogue states."
Sater led federal investigators to information on trade in missiles and precious metals as well as New York's Genovese and other crime families and those involved in so-called "Pump and Dump" and "Boiler Room" 1
He also gave US government officials what they "believed was bin Laden's satellite phone number and information on who supplied weapons to bin Laden," prosecutors wrote at the time, about two years before the terrorist leader was killed in a US military attack.
The applications, prior to Säter's death sentence in 2009, describe in detail the extensive assistance he had provided to federal investigators in intelligence and law enforcement cases. He pleaded guilty to litigation in the case that established his partnership in 1998 and was sentenced to $ 25,000 as his verdict.
"His collaboration has covered a fantastic range of topics, ranging from sophisticated local and international criminal activity to issues related to the world's most dangerous terrorists and rogue states," his lawyers wrote 10 years ago.
His collaboration ended after The New York Times published a 2007 article about his work as a developer in the Trump Soho project and a Trump tower and hotel in Florida and his efforts as an informant, his lawyers said.
The documents unsecured Friday – a memo from prosecutors describing his cooperation and a letter from his lawyers to the judge before the verdict – do not refer to his associations with Trump aside from a mention of the Times article.
But in recent years, Sater has adapted more closely to Trump's organizational project, including until 2016. He spoke to the Special Council's Office 2017 as a witness.
Sater was a CEO of the Bayrock Group, which licensed the Trump name to build real estate in New York and Florida. Donald Trump and Sater appeared at public events together, gave joint interviews and signed paperwork regarding their business dealings. But in a deposition in 2013, Trump distanced himself and said he didn't know Sater well.
Satter's name, however, often came up in Robert Mueller's special counsel's investigation into Russian involvement in the 2016 US election.
In 2015, Sater had contacted Trump's personal lawyer Michael Cohen about the possibility of developing a Trump Tower in Moscow. Trump approved the negotiations, and it continued into 2016 before it evaporated, Mueller said.
"In early negotiations with the Trump Organization, Sater had referred to the need for government approval and his attempt to set up meetings with Russian officials," Mueller wrote, citing an email between Sater and Cohen.
"Beginning in late 2015, Sater repeatedly tried to arrange Cohen and candidate Trump, as representatives of the Trump organization, to travel to Russia to meet Russian government officials and possible funding partners," the Mueller report said. Sater continued to discuss the Moscow trip in spring 2016, but it never happened.