The interpretation of the difference observed between the radial distribution of globular clusters and
that of halo--bulge stars in elliptical galaxies is discussed in terms of evolution of their globular
cluster systems. I present a short summary of the evidence that dynamical evolution of globular cluster
systems is not only able to explain the flattening of their distribution toward the galactic center,
but also it may have played an important role on the primordial activity of the parent galaxy.