Oli, since Roth is so closely based on Meyer Lansky, Ola is based on Vincent (Jimmy Blue Eyes) Alo (name is an anagram), a high ranking capo in the Genovese familly. Lansky was close to Genovese family ever since his close friendship with Charlie Luciano. But, unlike Ola, the real-llife Alo wasn't servile--he was Lansky's partner, protector and close friend.