From the Terminus Gate rulebook:
Where there are
ships, there are marauders. Marauder
crews pillage settlements, hijack cargo, and otherwise plunder their way from
system to system. Marauder fleets
terrorize whole systems, taking what they want from whoever they want. Outer systems remain in the most danger as
their system governors are slow to react or, worse, are in league with
marauders themselves.