  In this paper we extend Hardy's nonlocality proof for two spin-1/2 particles
[PRL 71 (1993) 1665] to the case of n spin-1/2 particles configured in the
generalized GHZ state. We show that, for all n \geq 3, any entangled GHZ state
violates the Bell inequality associated with the Hardy experiment. This feature
is important since it has been shown [PRL 88 (2002) 210402] that, for all n
odd, there are entangled GHZ states that do not violate any standard n-particle
correlation Bell inequality.
