Ed Bryant (R-Tennessee), Lindsey Graham (R-South Carolina), Asa Hutchinson (R-Arkansas) and James Rogan (R-California) are expected to take the lead for the prosecution team.

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He could also be charged later in state courts, but for now federal authorities will lead the prosecution.

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Syriza called for swift prosecution of the men, warning that "tolerance of the fascist Golden Dawn party will lead to a loss of life".

BBC: Greek MP 'attacked by far-right Golden Dawn'