Margaret Thatcher's son Mark was arrested after a plot involving people with this occupation. For 10 points each:
[10m] Name this occupation. Thirteen people with this occupation were imprisoned or executed after the Luanda Trial, while Taffy Williams and Rolf Steiner were Europeans with this occupation in Biafra.
ANSWER: mercenaries [accept alternatives like soldiers for hire or private soldiers or private military contractors; prompt on just soldiers]
[10e] Two-Gun Cohen and One-Armed Sutton were mercenaries during this country's Warlord Era, which ended when the KMT took Beijing in the Northern Expedition.
ANSWER: China [or People's Republic of China]
[10h] American Olympian Sam Hall was released by this group after they realized he was just pretending to be a mercenary. This group came to power in a revolt that began after the assassination of the editor of the La Prensa newspaper.
ANSWER: Sandinistas [or Sandinista National Liberation Front]
<Govind Prabhakar , History - World - Mixed/Any>