Do Massive Black Holes Exist at the Center of Galaxies?

General relativistic models of star clusters with large redshifts are investigated to see whether such objects can be stable and long-lived based on evaporation and collision timescales and stability criteria. We find that physically reasonable models of massive clusters of stellar remnants can exist with masses $\geq 10^6 M_{\odot}$, which could simulate black holes at the center of galaxies with large $M/L$ ratios and gas motions of order $\geq 10^3 km/s$. It follows that the evidence is not conclusive for massive dark objects at the center of galaxies being black holes