IF YOU WANT TO SEE REAL COLLUSION...:

A graduate of Harvard Law School, Mr. Ohr joined the Justice Department in 1991 from a law firm in San Francisco. As a federal prosecutor in Manhattan, he twice won top awards and rose to be chief of the district's violent gangs unit.

He had a knack for managing people and pushing cases forward, former associates said, which helped propel him to a job at the Justice Department in Washington in 1999 as the head of the organized crime and racketeering section. He provided the F.B.I. with resources to prosecute cases and navigated relationships with the intelligence community, brokering disputes and earning the respect of the F.B.I. and prosecutors.

As oligarchs and gangs flourished in Eurasia after the fall of the Soviet Union, Mr. Ohr, his deputies, the F.B.I. and federal prosecutors tackled Russian crime syndicates, said J. Kenneth Lowrie, a former federal prosecutor who was Mr. Ohr's longtime deputy.

"Until 9/11, organized crime was one of the main priority criminal programs at the Justice Department," said Mr. Lowrie, who retired in 2008. "Russian organized crime was a focus. Bruce knew a lot of the Russia stuff and traveled there."

Mr. Ohr's section supported the 2000 prosecution of Pavlo Lazarenko, the former prime minister of Ukraine, who was convicted of money laundering, wire fraud and extortion in a case brought by the office of the United States attorney in San Francisco at the time, Robert S. Mueller III, who is now the special counsel.

Also under Mr. Ohr's oversight, a Russian crime boss, Semion Mogilevich, was indicted in 2003 on charges of defrauding a company outside of Philadelphia out of $150 million. The case made headlines and laid the groundwork for Justice Department efforts to combat Russian organized crime overseas. [...]

Mr. Ohr was a manager, not a litigator, who built bridges with law enforcement agencies around the world, former Justice Department officials said. He sent top deputies to Hungary to root out the nascent Russian mob in the early 2000s. F.B.I. agents viewed the commitment as a sign of his seriousness about combating Russian organized crime.

In 2006, Mr. Ohr was part of a group of government officials who revoked the visa of Oleg Deripaska, a Russian billionaire and aluminum magnate. Officials were concerned that Mr. Deripaska might try to come to the United States to launder illicit profits through real estate, a former law enforcement official said.

Mr. Deripaska, a close ally of President Vladimir V. Putin of Russia, has been tied to the former Trump campaign chairman Paul Manafort, who was convicted last week of tax and bank fraud. In 2016, Mr. Manafort offered private campaign briefings to Mr. Deripaska, raising concerns about the prospect of Russians wielding influence inside the White House. In April, the United States imposed sanctions on Mr. Deripaska.

In 2007, Mr. Ohr met Mr. Steele, who was still with MI-6, the British spy service, according to a former senior American law enforcement official who knows both men. Both governments approved their contacts, the former official said.

Mr. Ohr moved on to other senior jobs, starting in 2010 as counsel for international relations in the Justice Department's transnational organized crime and international affairs section, where he bolstered partnerships with foreign law enforcement agencies. In 2014, he became the director of the Organized Crime Drug Enforcement Task Forces, distributing grant money to bolster prosecutorial work.

He stayed in touch with Mr. Steele, meeting him in Rome in 2014 and in Washington in 2015.

For the F.B.I., their relationship would come in handy. A longtime informant who provided valuable tips on corruption, Mr. Steele violated his confidentiality agreement with the F.B.I. when he disclosed to a reporter in the months before the 2016 election that he had been working with the bureau. He had expressed frustration that his information about Mr. Trump, gathered for Fusion GPS, the research firm that hired him on behalf of Democrats to research the candidate, had gone seemingly nowhere in the F.B.I.

In early November 2016, the agent handling Mr. Steele told him not to obtain intelligence "on behalf of the F.B.I."

That did not stop F.B.I. agents from collecting coveted information from Mr. Steele. While the F.B.I. could no longer considered him a confidential informant, former officials said, agents eager to assess the dossier as part of their counterintelligence investigation into links between Trump associates and Russia's election interference could still document what he was telling a third party -- Mr. Ohr.

And when Mr. Ohr approached the F.B.I. about his relationship with Mr. Steele, bureau officials saw an opportunity.

Mr. Ohr met with Mr. Steele almost a dozen times beginning in late 2016 through May 2017, according to congressional officials. F.B.I. agents interviewed Mr. Ohr after the meetings and documented the information. [...]

[T]he arrangement was not unusual, former law enforcement officials said. Senior F.B.I. officials were aware of the Steele meetings and those involved followed internal guidelines, a former official said.

Mr. Ohr's contacts with Mr. Steele were one small part of a broader effort to determine whether the allegations in the dossier were true, a former official said. The F.B.I. also did not have all the reports that Mr. Steele had produced and agents were keen to get them.

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