Mind Control (group) – The ability to alter the perceptions of others, and general ability to control the actions of at least three or more people at the same time.
Karma (Marvel) has a brother that is able to control the all Fantastic Four at the same time (Marvel Team-Up #100)!
In Adventure Comics V1 #349, Universo (DC) was almost able to control six legionnaires at the same time. This includes Saturn Girl (DC) and she is a powerful telepath and presumably has some immunity to mind control.
Peter “Sting” Stanchek (Valiant) uses his power to kill hundreds of rebels but feels guilty.
Starro (DC) – Who’s Who in the DC Universe #13
Solovar (DC) – Injustice 2 #43