Persuasion or Leadership (I don’t remember if there is and Intimidation option or not). Level 3 might be enough, but if you want to be sure make it level 4. I don’t remember the exact options, but if you give an order then you need leadership, if you want to be more diplomatic or you want to trick someone then persuasion and threatening is obviously tied to intimidation.
Now I have a question too. In part 2 how can I capture Benton? Earlier it seemed that no matter what I do we always capture Benton, but now he always escapes. Were changes made regarding this? We can not caprure him anymore?
Edit: Another question regarding part 3: If I choose not to be the official leader, am I still supposed to asign people to do improvements and reinformences to the junkyard? In my one playthrough when Jaime was the leader (and my MC just wanted to leave as much of this leadership stuff up to Jaime as possible,) I noticed when I got the report from Rachel that no improvements or reinformences were made.