Virginia Giuffre 's brother is drawing a clear line in the sand as members of Congress try to force a vote on releasing the Jeffrey Epstein files ... he says anyone who opposes the effort is on the side of rich and powerful abusers.

Sky Roberts made an emotional plea to lawmakers Wednesday during a press conference on Capitol Hill, where Epstein survivors called on Congress to make the files public. Getty

Sky's sister Virginia is the most famous victim of Epstein's sex-trafficking ring ... and she died in April at 41 in what police in Australia said was suicide, though her family doubts she took her own life .

Virginia claimed she was just 16 years old when Ghislaine Maxwell recruited her at Trump's Mar-a-Lago club in Florida into Epstein's sex trafficking rin

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