The Black Bunch [a.k.a. Super Sisters] (1973)

Starring:

• Gladys Bunker
• Anita Cunningham
• Rina Russell
• Carmen Wiley

IMDB.com
In Africa, four native women join and are hired to find a wealthy man's son who has disappeared, and use the opportunity to get revenge on a gang of mercenaries who have massacred the inhabitants of the womens' village.