As as mastermind, you can intimidate enemies.
DOMINATOR
BASIC: You can now intimidate non-special enemies. Less well trained enemies
are easier to intimidate.ACE: The power and range of your intimidation is increased.
In this video (bank heist 100% stealth), a player seems able to intimidate as many guards as he wants, the key point being to start yelling when the red excalamation point appears. But it's not possible to chain intimidations this way anymore (I tried it myself), as it's stated in one of the video's comments:
So it is possible to intimidate another enemy after a certain time ? How long ?
Best Answer
The rules for this were changed 5th of March 2014 (emphasis mine):
So one dominated guard or police officer per player with dominator. That means no, you cannot dominate multiple guards at once. You will need a friend to help.
Before this change the rule (which console and unpatched versions might still follow) was one dominated guard or police at a time. Want another one? Kill the existing one.