  The consequences of CP- and CPT-invariance for production and subsequent
decay of Majorana fermions are analytically studied. We derive general symmetry
relations for the spin density matrix for production of Majorana fermions by
polarized fermion-antifermion annihilation which allow to distinguish Majorana
from Dirac fermions. We discuss the influence of the spin correlations on
energy and angular distributions of the decay products. Numerical results are
shown for the production of neutralinos and charginos with subsequent leptonic
decay at a future linear collider with longitudinally polarized beams.
