  In a non-abelian gauge theory the $t$-channel multiparticle unitarity
equations continued in the complex j-plane can be systematically expanded
around $j=1$. The combination of Ward identity constraints with unitarity is
sufficient to produce directly many results obtained by Regge limit leading-log
and next-to-leading log momentum space calculations. The $O(g^2)$ BFKL kernel
is completely determined. $O(g^4)$ contributions to the kernel are also
determined, including the leading contribution of a new partial-wave amplitude
- previously identified as a separate forward component with a holomorphically
factorizable spectrum. For this amplitude the only scale ambiguity is the
overall normalization and it is anticipated to be a new conformally invariant
kernel. The results suggest that all conformally invariant reggeon interactions
are determined by $t$-channel unitarity.
