Black Accuses Harris of Trying to Destroy Him For Apollo Control

Leon Black escalated his fight against former business partner Josh Harris, naming him as a defendant in a lawsuit that lays bare the bitter battle for control of Apollo Global Management Inc. last year.

The expanded allegations, in an amended complaint on Monday, add to a lawsuit initially brought in October against former Russian model Guzel Ganieva.

The revised claim portrays the drama within the storied New York investment firm as a Shakespearean tragedy, accusing Harris, a co-founder of the firm, of organizing a coup to overthrow Black and become the chief executive officer of Apollo.

Leon Black

Photographer: Patrick T. Fallon/Bloomberg

Black, 70, ...