In 1972, Karume was assassinated, and Babu along with 40 other Umma Party members were jailed for alleged involvement, despite a lack of evidence, leading to death sentences three years later, but were finally released after an international campaign.
The killing of Karume in 1972 prompted the detention of Babu and 40 other Umma Party members for alleged ties to the crime, despite a lack of concrete proof. Eventually, three years later, they received capital punishment, but were finally released after an international outcry.