Like a joke...
The Allies background represents groups of people, not individuals. Each dot represents the size and scope of the group. Each group must have individual ratings even if there is a degree of overlap with others.
Allies can represent influence over city or state government, bureaucratic institutions, police, federal marshals, gangs or organized crime syndicates, as well as nomadic tribes such as gypsy families and the like. Most commonly, the Allies background represents sway a character has over mortal institutions, and thus each dot will augment other types of ability or background rolls. For example, if you have Allies: Police and Influence: Police, those dice pools would be added together for the influence roll.
On a basic level, Allies may be used to purchase simple troops. In this case, each dot expended brings five “soldiers”. This is not the same as the Military Force background, though; using Allies in this fashion runs the risk of permanently lowering the rating should those troops be killed in action.
Furthermore, not all Allies can be used in this fashion. Having influence over a group of IRA terrorists certainly qualifies, but having influence over PETA protesters does not. Quality of troops granted by this background is dependent on the group the Allies background has been chosen to represent. For example, using this background to represent police forces will net soldiers with significantly better combat training than Allies chosen to represent a gypsy family.