The Sicilian mafia was definitely involved in heroin as well, but in Europe I don't think they were as big as a source as the Chinese were in the 70's and 80's. Especially from the mid 70's to mid 80's with the Corleone-Palermo conflict, a lot of European traffickers did business with the Chinese instead. The USA is a different story.
sicilian mafia supplied the whole italian market that alone was very big and to a lesser extent other places like germany, switzerland, france and uk, so i don't think chineses were the biggest source in europe at that time, they supplied the benelux area mostly
