Grock became known as the "king of clowns" but the Swiss entertainer who made the world laugh is now in the spotlight over his connections with Adolf Hitler.
A Swiss museum, which has recently acquired Grock's archive, is researching links between the performer -- considered by peers to be the greatest musical clown of his time -- and the dictator of Nazi Germany.
In the first half of the 20th century, Grock's success rivalled that of Charlie Chaplin. But while Chaplin satirised Hitler, Grock seems to have welcomed him into his dressing room.
Last month, the Neues Museum Biel took possession of around a thousand items from Grock's collection.
Sound recordings from shows, letters, photographs and musical scores were donated by Grock's 74-year-old great-nephew Raymond Naef.
Via Naef, Grock's stage costumes and musical instruments were donated by Switzerland's Knie family circus dynasty.
But the Neues Museum Biel did not want to put on a Grock exhibition without first exploring the artist's life off-stage, where he developed a reputation as a shrewd businessman.
"It's the museum's responsibility. It's absolutely necessary," the art and history museum's director Bernadette Walter told AFP.
- Hitler telegram -
Wettach published several autobiographies and his great-nephew Naef wrote a book and curated a 2002 exhibition about Grock's career -- but until now, no historian has investigated the nature of his Nazi connections.
The museum did not consider turning down his archive, which entails conducting lots of research -- something Walter compared to the investigations that cultural institutions carry out into artworks looted by the Nazis.
"A museum must also tell stories that are not always spotless," the director said, arguing that the past should not simply be forgotten.
At a May 12 online auction, the museum tried to buy, for research purposes, a seasonal greetings telegram that Grock sent to Hitler in 1942.
Grock performed in Germany before the Nazis came to power in 1933, and the museum wants to see whether he adapted his stage show afterwards.
Grock always said he was apolitical and his autobiography mentions his shows in Britain, France and the United States, said Walter.
"He played when he was paid. We know that Grock was opportunistic, but that cannot be used as an excuse."
- No joke -
Laurent Diercksen, who wrote the 1999 book "Grock: An Extraordinary Destiny", said the acrobat, juggler and multi-instrumentalist "didn't give a damn about politics" and focused on "success".
"We cannot judge him on a single letter, an isolated act or one revelation taken out of context," the journalist told AFP, finding it a shame that the great music hall artiste might primarily be remembered for his "so-called Nazi sympathies".
Born in 1880, Grock -- real name Adrien Wettach -- grew up in the Bernese Jura mountains above the city of Biel in northern Switzerland.
He chose his pseudonym in the early 1900s, when he replaced Brock in Brick and Brock, a famous duo of the time.
"He brought laughter to an era when there wasn't much to laugh about," said his great-nephew, who nonetheless recalled that Grock's connections with the Nazis had caused family disputes.
But he wanted Grock's collection to be publicly accessible for historical research and potentially be exhibited, adding that people needed to distinguish between the art and the artiste.
"We do not destroy the houses built by the architect Le Corbusier simply because he was also a bit of a fascist," Naef concluded.
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© Agence France-Presse
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