  We propose models describing the collective dynamics of two opposing groups
of individuals with stochastic communication. Individuals from the same group
are assumed to align in a stochastic manner, while individuals from different
groups are assumed to anti-align. Under reasonable assumptions, we prove the
large time behavior of separation, in the sense that the variation inside a
group is much less than the distance between the two groups. The separation
phenomena are verified by numerical simulations.
