The CIA certainly helped in both cases, but the actual state apparatus in both Venezuela and Chile worked against the socialists. In Chile, Pinochet used the capitalist military to coup Allende, in Venezuela companies and businesses resist any progress from the PSUV. The solution is to replace the capitalist state with a socialist one, which doesn't make you immune to CIA influence, but does provide the basis for maintaining socialism domestically without retaining mechanisms that rely on private property to function.