The british promised them better infustructure
While there was alway the "mob" aka organized crime. the point of organized crime is to bring "illegal" goods and services to those willing to pay for it. just like mcdonalds bring Hamburgers to those who want to eat hamburgers. They are very organized and need to be to make a profit. prohibition make all alcohol illegal. those best to profit from this now ''illegal" good were those who already had a structure to provide "illegal" goods and services. since everyone like alcohol, be it simply beer or a whisky, organized crime was able to make lot so money, which the organization invested in itself to provide futher infustructre to provide good and services. so after alcohol become legal again, organized crime still had this infustructure in place to provide goods and services that have not been legal yet, such as other drugs, prositution, stolen goods (at cheaper prices), etc.
While there was alway the "mob" aka organized crime. the point of organized crime is to bring "illegal" goods and services to those willing to pay for it. just like mcdonalds bring Hamburgers to those who want to eat hamburgers. They are very organized and need to be to make a profit. prohibition make all alcohol illegal. those best to profit from this now ''illegal" good were those who already had a structure to provide "illegal" goods and services. since everyone like alcohol, be it simply beer or a whisky, organized crime was able to make lot so money, which the organization invested in itself to provide futher infustructre to provide good and services. so after alcohol become legal again, organized crime still had this infustructure in place to provide goods and services that have not been legal yet, such as other drugs, prositution, stolen goods (at cheaper prices), etc.