A Look At The World's Most Powerful Mercenary Armies

Security giant G4S is the second-largest private employer on earth

With more than 625,000 employees, this listed security giant is the second-largest private employer in the world (behind Wal-Mart). While some of its business is focused on routine bank, prison and airport security, G4S also plays an important role in crisis-zones right around the world.

Read & View more @Source: BusinessInsider