sentences:  A Jew, he spent the Second World War in hiding in southern France, at one point helped by the art critic and resistance leader Jean Cassou.Uhde is also known as the principal organiser of the first Naive Art exhibition, which took place in Paris in 1928.The participants were Henri Rousseau, André Bauchant, Camille Bombois, Séraphine Louis and Louis Vivin, known collectively as the Sacred Heart painters.