One of Washington's most prominent lobbying firms is on the verge of shuttering after becoming ensnared by special counsel Robert Mueller's investigation. Kimberley Fritts, the chief executive of the Podesta Group, told employees during a Thursday staff meeting that the firm would cease to exist at the end of the year. The developments come after the Podesta Group was tied last week to Mueller's indictments of Paul Manafort and Rick Gates, who pleaded not guilty after being charged with failing to file as foreign agents relating to a decade of work they did for ... a pro-Russia political party in the Ukraine. Mueller's special investigation team has also interviewed multiple people from the Podesta Group, which was recruited by Manafort and Gates to work along with another firm. Talk of potentially closing the Podesta Group marks a dramatic downfall of one of K Street's most iconic and well-connected firms. In its heyday, Podesta Group was the largest non-law firm lobbying organization in Washington. Tony Podesta, the firm's founder and chairman, helped fuel the company with work for foreign governments. He and his brother, John, founded the company almost three decades ago. John Podesta chaired Hillary Clinton's 2016 presidential campaign. He left the firm in 1993. Mueller is looking into whether the Podesta Group properly identified to federal authorities its foreign advocacy for ... a Brussels-based non-profit group that federal prosecutors have called a mouthpiece for pro-Russian Ukrainian politicians.