Excerpt from NBC’s exclusive article. In the original article, Podesta Group is mentioned 9 paragraphs down.

NBC News:

Special Counsel Robert Mueller issued grand jury subpoenas in recent days seeking testimony from public relations executives who worked on an international campaign organized by Paul Manafort, people directly familiar with the matter told NBC News.

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Manafort also was present at a June 2016 Trump Tower meeting with a Russian lobbyist and a Russian lawyer, along with Donald Trump Jr. and Kushner. NBC News has previously reported that Kushner is under scrutiny by investigators, and that Mueller is examining whether President Trump obstructed justice.

The executive said six firms participated in the public relations effort that Manafort coordinated, paid for by a Brussels-based non-profit called the European Center for a Modern Ukraine. The stated goal was to build support for Ukraine’s entry into the European Union.

Two of the firms, Podesta Group and Mercury LLC, worked in Washington with Manafort partner Rick Gates, according to lobbying disclosure records. Three other firms worked in Europe, the executive said. NBC News could not confirm the identity of those three.