To gain the revenues of Congolese resources, Mobutu initially nationalized foreign-owned firms and forced European investors out of the country. But in many cases he handed the management of these firms to relatives and close associates, who quickly exercised their own corruption and stole the companies' assets. By 1977, this had precipitated such an economic slump that Mobutu was forced to try to woo foreign investors back. Katangan rebels based in Angola invaded Zaire that year, in retaliation for Mobutu's support for anti-MPLA rebels. France airlifted 1,500 Moroccan paratroopers into the country and repulsed the rebels, ending Shaba I. The rebels attacked Zaire again, in greater numbers, in the Shaba II invasion of 1978. The governments of Belgium and France deployed troops with logistical support from the United States and defeated the rebels again.