Meet Felix Sater, the Russian-born, bar-fighting felon with ties to the mob at the center of Mueller's Russia investigation

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Felix Sater's name continues to pop up in relation to the investigation into Russian election interference.

Felix Sater, a Russian-born businessman with a checkered past, has emerged as a central figure in special counsel Robert Mueller's investigation into Russian election interference.

Here's a rundown on Sater's background and why his name continues to pop up in relation to Mueller's ongoing probe.

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