In his later years, Stalin was in poor health. He took increasingly long holidays; in 1950 and again in 1951 he spent almost five months vacationing at his Abkhazian dacha. Stalin nevertheless mistrusted his doctors; in January 1952 he had one imprisoned after they suggested that he should retire to improve his health. In September 1952, several Kremlin doctors were arrested for allegedly plotting to kill senior politicians in what came to be known as the Doctors' Plot; the majority of the accused were Jewish. He instructed the arrested doctors to be tortured to ensure confession. In November, the Slánský trial took place in Czechoslovakia as 13 senior Communist Party figures, 11 of them Jewish, were accused and convicted of being part of a vast Zionist-American conspiracy to subvert Eastern Bloc governments. That same month, a much publicised trial of accused Jewish industrial wreckers took place in Ukraine. In 1951, he initiated the Mingrelian affair, a purge of the Georgian branch of the Communist Party which resulted in over 11,000 deportations.