BERLIN (Reuters) - The head of an organization of former Russian spies was quoted as saying on Thursday Moscow abandoned its policy of assassinating enemies long ago, and that Alexander Litvinenko was probably murdered by criminals. Former KGB agent Valentin Velichko said fellow former agent Litvinenko, who died in London on November 23 from radiation poisoning, was a traitor but was not killed by Moscow. "That was long ago. It belonged to the days of Stalin," Velichko, head of the Veterans of Foreign Intelligence, told Die Welt newspaper in an interview. Millions died under the rule of dictator Josef Stalin.