Mercenaries (Battle Tech)
Mercenaries are an important part of the BattleTech fictional universe; the Inner Sphere and Periphery have many private military companies.
As the various mercenary factions are independent and competing businesses, it is quite rare for them to work as a faction together. Nonetheless, some of the companies are quite powerful and their actions have influenced the history of the known universe.
Read more about Mercenaries (Battle Tech): Employment, Companies, Locations