"I heard the sad news (of Castro's demise). He was one of greatest leaders of the anti-imperialist movement, particularly 'third world', and he is the man who successfully withstood and fought back the onslaught of imperialism," CPI General Secretary Suravaram Sudhakar Reddy told PTI.
"We pay our most respectable revolutionary homage (to Castro)", he said.
"He was an inspiration for several generations and, responsible for transformation in Latin America, the backyard of US imperialism, into a Left bastion," Reddy added.
The 90-year-old former Cuban President died in Havana in Cuba.