The global properties of spatially homogeneous cosmological models wit
h collisionless matter are studied. It is shown that as long as the me
an curvature of the hypersurfaces of homogeneity remains finite no sin
gularity can occur in finite proper time as measured by observers whos
e worldlines are orthogonal to these hypersurfaces. Strong cosmic cens
orship is then proved for the Bianchi I, Bianchi IX, and Kantowski-Sac
hs symmetry classes. (C) 1994 Academic Press, Inc.