  We investigate the one-dimensional Kondo lattice model (1D KLM) for
ferromagnetic Kondo couplings, by using the bosonization method. The
ferromagnet ic 2-leg spin ladder and the S=1 antiferromagnet occur as new
one-dimensional Kondo insulators, for a half-filled band. First,a very small
hole-doping makes the charge sector massless and it can produce, either an
incommensurate RKKY interaction or a S=1 ferromagnet according to the strength
of the ferromagnetic Kondo coupling. Second, we investigate, the effects of a
weak and quenched disorder on these two Kondo insulators, by applying
renormalization group methods: the Anderson localization is suppressed only in
the context of a strong ferromagnetic Kondo coupling.
