  We present a no-go result on consistent Noether interactions among
higher-spin gauge fields on anti-de Sitter space-times. We show that there is a
non-local obstruction at the classical level to consistent interacting field
theory descriptions of massless higher-spin particles that are described in the
free limit by the free Fronsdal action, under the assumption that such theories
arise from the gauging of a global higher-spin symmetry. Our result suggests
that the Fronsdal programme for introducing interactions among higher-spin
gauge fields cannot be completed without introducing new guiding principles,
which could lie beyond the framework of classical field theory.
