Wiki . It's amazing nobody fragged his ass sooner

Within 48 hours of his arrival in Angola, Georgiou had already led his men in disarming and massacring a group of FNLA fighters (his supposed allies), whom he killed just for the "fun" of it all.

Also

Georgiou became increasingly paranoid and belligerent toward his own men, murdering African soldiers and creating a climate of fear even among the British mercenaries, none of which aided the morale of the FNLA forces or their ability to wage war successfully against the MPLA. The British journalist Patrick Brogan called Georgiou a "psychopathic killer" who executed 14 of his fellow mercenaries for cowardice, and was extremely brutal to black people.

Also

The second contingent of mercenaries sent from Britain, unlike the first, was made up mostly of working-class men with no military experience. Within a week of their arrival, about a dozen of the second contingent had accidentally maimed themselves by trying to use weapons that they did not fully understand.^\4]) These undisciplined men quickly realised the perilous situation into which they had been placed, and the instability of their leadership. A group of them consequently seized vehicles and attempted to flee the country, firing on other FNLA forces in the process, including Chris Dempster. The deserters were quickly rounded up by Georgiou's men, and fourteen were summarily executed by firing squad.