Which group is primarily controlled by La eMe?

La eMe, also known as the Mexican Mafia, primarily controls the Surenos. This gang is predominantly made up of Hispanic members and has a significant presence in Southern California and beyond. The relationship between La eMe and the Surenos is hierarchical; La eMe provides structure and guidance to Sureno gangs, which often affiliate with them to gain protection and resources. This affiliation allows La eMe to exert considerable influence and power within the Sureno ranks, thereby maintaining control over their activities.

The other groups mentioned, such as the Bloods and Crips, have their own distinct leadership and territorial control and do not have connections to La eMe. MS-13 is a separate gang that primarily operates independently of La eMe, focusing on its own criminal enterprise and structure. Thus, the connection of La eMe with the Surenos is what makes this answer correct.