Jurors should be allowed to hear a businessman's nickname, "Putin's chef," at an upcoming trial involving allegations that Russian companies and individuals fraudulently used social media accounts to sow discord in the U.S. electorate leading up to the 2016 presidential election, federal prosecutors said in a court filing Wednesday.

That nickname is attached in U.S. and Russian media reports to Yevgeny Prigozhin, a businessman whom prosecutors have identified as the controlling officer of a Russian company called Concord Management and Consulting. Prosecutors in Washington charged Concord, Prigozhin and a dozen others in a wide-ranging case accusing Russians of posing as Americans on Twitter and Facebook and purchasing advertisements on social media with the goal of influencing the election in favor of President Donald Trump.

Wednesday's court filing came amid a clash over what evidence should be allowed at Concord Management's trial, which is slated to begin in April. U.S. District Judge Dabney Friedrich of the District of Columbia, a 2017 appointee to Washington's federal district court, is set to meet with the attorneys Friday in court, and she can be expected in coming weeks to issue rulings that will shape the contours of the trial. Friedrich earlier refused to dismiss the indictment.

Lawyers for Concord Management, represented by Reed Smith, broadly contend any use of nicknames at trial would be unfairly prejudicial in linking the company to the Kremlin. They argue the nicknames "Putin's chef" and "Putin's cook" are purely media-driven and inadmissible.

"Reference to these monikers and evidence of the same should be excluded at trial because it is irrelevant, and improperly and implicitly links Concord to Vladmir Putin and the Russian government, which would be unduly prejudicial to Concord," Reed Smith partner Eric Dubelier argued in a court filing.

Prigozhin, whose restaurants and catering businesses gave rise to his nickname, has figured prominently in the case, even as he has refused to appear in U.S. court. Prosecutors contend he approved and financed the activities of the Internet Research Agency, the Russian outfit at the center of the alleged social media conspiracy.

"The government intends to introduce limited evidence regarding Prigozhin's various nicknames for the purpose of connecting Prigozhin to the activities of the Internet Research Agency (IRA)," prosecutors said in their new court filing.

Concord Management is so far the only Russian defendant in the case to answer to the charges in the U.S. District Court for the District of Columbia. Ever since the charges were filed in 2018, prosecutors have sparred with Concord Management's lead defense lawyer, Dubelier, who has argued the government has charged the Russian firm with a "make-believe crime."

Concord Management's case has posed challenges distinct from other prosecutions rooted in former Special Counsel Robert Mueller III's investigation of Russia's interference in the 2016 presidential election.

Those other cases have involved allegations against U.S.-based individuals of illegal lobbying, financial fraud and making false statements—either to Congress or federal investigators. Prosecutors secured convictions or guilty pleas from an array of people in Trump's world, including his former Trump campaign chairman Paul Manafort and his longtime business partner Rick Gates; Roger Stone, a longtime Trump confidante; and Michael Flynn, formerly Trump's national security adviser. Flynn, who faces sentencing next month, is trying to withdraw his guilty plea.

The case against the Russian defendants has opened the U.S. government up to discovery touching on sensitive national security information. Friedrich put restrictions on the defense team's ability to share sensitive information kicked up in discovery, requiring that materials be kept "in a locked room at Reed Smith's offices" and not be stored on any device connected to the internet.

In their filing Wednesday, prosecutors redacted the evidence they said they intend to introduce with respect to the monikers "Putin's chef" and "Putin's cook." The prosecution team includes Heather Alpino of the Justice Department's national security division and assistant U.S. attorneys Luke Jones, Peter Lallas and Jonathan Kravis.

"The government does not intend to introduce any evidence that Vladimir Putin directed the actions of the conspirators or evidence connecting Prigozhin to Putin other than Prigozhin's nickname," prosecutors said in Wednesday's filing.

The government said it also wants to show jurors various Facebook and Twitter accounts associated with the alleged conspiracy.

The accounts, including "March for Trump" and "Secured Borders," the government said, were "all related to the conspirators' overarching goal of sowing discord in the American political system and favoring one candidate over another." The government has alleged the social media accounts were used "to post politically and social incendiary messages."

Eric Dubelier Eric Dubelier of Reed Smith exits federal court in Washington, D.C., on June 15, 2018. Photo: Diego M. Radzinschi / National Law Journal

Concord Management's lawyers at Reed Smith, including Dubelier and Katherine Seikaly, urged Friedrich earlier this month to limit the information prosecutors can show to jurors. "The use of these nicknames is completely avoidable because they appear only in media reports, which are, in any case, inadmissible," Dubelier argued.

The Reed Smith team argued the identification of the defendants in the case "is not a concern" and so there's no reason the government needs to use any nickname.

"Mr. Prigozhin is the only defendant named in the Indictment with the surname Prigozhin. And to the extent that there are any other individuals named Prigozhin that are relevant to this case (Concord is not aware of any), the government could easily distinguish them by using Mr. Prigozhin's first name, Yevgeniy," Dubelier wrote.

One designation the government said it does not intend to use with respect to Prigozhin: "oligarch."