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The art was seized Wednesday from the Art Institute of Chicago, the Carnegie Museums of Pittsburgh and the Allen Memorial Art Museum at Oberlin College in Ohio.

Warrants issued by Manhattan District Attorney Alvin Bragg’s office say there's reasonable cause to believe the three artworks are stolen property.

The three works and several others from the collection, which Grünbaum began assembling in the 1920s, are already the subject of civil litigation on behalf of his heirs. They believe the entertainer was forced to cede ownership of his artworks under duress.

The son of a Jewish art dealer in what was then Moravia, Grünbaum studied law but began performing in cabarets in Vienna in 1906.

in Vienna and Berlin by the time Adolf Hitler rose to power, Grünbaum challenged the Nazi authorities in his work. He once quipped from a darkened stage, “I can’t see a thing, not a single thing; I must have stumbled into ºÚÁϳԹÏÍø Socialist culture.â€�

Grünbaum was arrested and sent to Dachau in 1938. He gave his final performance for fellow inmates on New Year's Eve 1940 while gravely ill, then died on Jan. 14, 1941.

The three pieces seized by Bragg's office are: “Russian War Prisoner,� a watercolor and pencil on paper piece valued at $1.25 million, which was seized from the Art Institute; “Portrait of a Man,� a pencil on paper drawing valued at $1 million and seized from the Carnegie Museum of Art; and “Girl With Black Hair,� a watercolor and pencil on paper work valued at $1.5 million and taken from Oberlin.

The Art Institute said in a statement Thursday, “We are confident in our legal acquisition and lawful possession of this work. The piece is the subject of civil litigation in federal court, where this dispute is being properly litigated and where we are also defending our legal ownership.�

The Carnegie Museum said it was committed to “acting in accordance with ethical, legal, and professional requirements and norms� and would cooperate with the authorities.

A request for comment was sent to the Oberlin museum.

Before the warrants were issued Wednesday, the Grünbaum heirs had filed civil claims against the three museums and several other defendants seeking the return of artworks that they say were looted from Grünbaum.

They when a New York judge ruled that two works by Schiele had to be turned over to Grünbaum's heirs under the Holocaust Expropriated Recovery Act, passed by Congress in 2016.

In that case, the attorney for London art dealer of Richard Nagy said Nagy was the rightful owner of the works because Grünbaum’s sister-in-law, Mathilde Lukacs, had sold them after his death.

But Judge Charles Ramos ruled that there was no evidence that Grünbaum had voluntarily transferred the artworks to Lukacs. “A signature at gunpoint cannot lead to a valid conveyance,� he wrote.

Raymond Dowd, the attorney for the heirs in their civil proceedings, referred questions about the seizure of the three works on Wednesday to the district attorney's office.

The actions taken by the Bragg's office follow the seizures of what investigators said were looted antiquities from museums in and

Manhattan prosecutors believe they have jurisdiction in all of the cases because the artworks were bought and sold by Manhattan art dealers at some point.

Douglas Cohen, a spokesperson for the district attorney, said he could not comment on the artworks seized except to say that they are part of an ongoing investigation.