I’m guessing that they did, drug trafficking is a huge & never ending money business. Unless countries legalize heroin or cocaine which is nearly impossible, there will always be a market. LCN got deeper into it because the US Government basically legalized some things that they were known for (Loansharking, Gambling, etc.) so they were forced to enter this market even more since their typical bread and butter (Truck hijacking, loansharking) were drying up as the 20th century went on.