  In this paper, the Lorentz transformation of the entangled Bell states with
momentum, not necessarily orthogonal to the boost direction, and spin, is
studied. We extended quantum correlations and Bell's inequality to the
relativistic regime by considering normalized relativistic observables. It is
shown that quantum information, along the perpendicular direction to the boost,
is eventually lost and Bell's inequality is not always violated for entangled
states in special relativity. This could impose restrictions to certain quantum
information processing such as quantum cryptography using massive particles.
