Cesodevo is correct. If you disbanded your party, you have no party, thus noone will follow you. Simply add those NPCs/prisoners you want to follow you back into your party.
It wont let me add him into my party it just says Prisoners: the guys picture, and nex to that "Handover to" a drop box I cant add anything to, and then the button.
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So it goes......
%Rom>"Do you think the Vatican depends on God for counter-infiltration?"
Thank you Steelflex for that very helpful comment.
Anyway Rom, it could be a bug, but try this first:
If you have any other NPCs around you, fire up the party screen and see if you can add them. (You should have 3 columns if you do have NPCs there you can add to your party.) If you can, then you should be able to add your prisoner as well. If you can't, then maybe something's missing.