Determined to keep the labor sector under control, Barrientos took away most of the gains it had achieved during the MNR's rule. He placed Comibol under the control of a military director and abolished the veto power of union leaders in management decisions. The president also cut the pay of the miners to the equivalent of US$0.80 a day and reduced the mining work force and the enormous Comibol bureaucracy by 10 percent. Finally, he destroyed the COB and the mine workers' union, suppressed all strike activity, disarmed the miners' militias, and exiled union leaders. Military troops again occupied the mines, and in 1967 they massacred miners and their families at the Catavi-Siglo XX mines.