The Queen actress portrayed real-life Holocaust survivor Maria Altmann, who fought the Austrian government to reclaim her family's Gustav Klimt painting Woman in Gold, in the film of the same name, and earlier this week (ends10Jun16), she visited a U.S. Senate sub-committee hearing in Washington, D.C and testified on behalf of a proposed bill concerning the return of lost artwork.

"It's a terribly sad fact that, more than 70 years later, victims of the Holocaust and their families are still contemplating whether to seek restitution for what was stolen from them and lost under the most horrible of circumstances," she said on Tuesday (07Jun16).

"Greed, cruelty, self-interest and domination will always be with us," she added. "Justice is much more difficult, so much more complex, but we all dream of justice."

"Art restitution is so much more than reclaiming a material good," she continued. "It is a moral imperative... It is about preserving the fundamental human condition and the opportunity (for Jews) to reclaim their culture, their history, their memories, and most importantly, their families."

Senator Chuck Schumer, who is comedian Amy Schumer's cousin, was so inspired by Helen's movie he proposed the legislation and is now tirelessly working to pass it into law.

"It is a drop of justice in what was an ocean of injustice," Schumer said.

Art historians estimate Nazi soldiers looted thousands of pieces of artwork from Jewish families during World War II. Much of the treasure has never been found and many fear it was destroyed.