  Relativistic light-front bound-state equations for mesons and baryons can be
constructed in the chiral limit from the supercharges of a superconformal
algebra which connect baryon and meson spectra. Quark masses break the
conformal invariance, but the basic underlying supersymmetric mechanism, which
transforms meson and baryon wave functions into each other, still holds and
gives remarkable connections across the entire spectrum of light and
heavy-light hadrons. We also briefly examine the consequences of extending the
supersymmetric relations to double-heavy mesons and baryons.
