By definition, any group selling illegal drugs is committing crimes.
However, street gangs do other things besides sell illegal drugs; they often engage in violence in their communities.
In addition, these folks are selling pure lab-tested drugs, rather than mixing them with other substances (“cutting”, often with harmful substances) or selling one drug as another (e.g. methamphetamine sold as MDMA), which are common in the street drug trade.
By definition, any group selling illegal drugs is committing crimes.
However, street gangs do other things besides sell illegal drugs; they often engage in violence in their communities.
In addition, these folks are selling pure lab-tested drugs, rather than mixing them with other substances (“cutting”, often with harmful substances) or selling one drug as another (e.g. methamphetamine sold as MDMA), which are common in the street drug trade.