Final answer:
Commercial robberies are usually committed by individuals and gangs, rather than corporations or government agencies.
Step-by-step explanation:
Commercial robberies can be committed by a variety of individuals or groups, but the most common perpetrators are individuals and gangs. Individuals may commit commercial robberies as stand-alone crimes, while gangs often organize and carry out these robberies as part of their criminal activities. Corporations and government agencies are unlikely to be the primary culprits as they are more involved in white-collar crimes.