  The patterns of $R$ violation resulting from imposition of a gauged U(1)
horizontal symmetry on the minimal supersymmetric standard model are
systematically analyzed. We concentrate on class of models with integer U(1)
charges chosen to reproduce the quark masses and mixings as well as charged
lepton masses exactly or approximately. The U(1) charges are further restricted
by the requirement that very large bilinear lepton number violating terms
should not be allowed in the superpotential. It is shown that this leads to
severely constrained patterns of trilinear interactions. Specifically, only
choice compatible with phenomenological restrictions is the one in which all
the trilinear $\lambda'_{ijk}$ and all but at most two trilinear
$\lambda_{ijk}$ couplings vanish or are enormously suppressed. The U(1)
symmetry can allow effective generation of bilinear lepton number violating
parameters through terms in the Kahler potential. Resulting models are
identified and structure of neutrino masses in some of these is briefly
discussed.
