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We have completed a spectroscopic survey of X-ray point sources in eight low-redshift clusters of galaxies (0.0510^41) 5 stress that additional, lower-luminosity AGN are expected to be present in the M_R < -20 mag cluster members. Our data unambiguously demonstrate that cluster galaxies host AGN more frequently than previously expected. Only four of these galaxies have obvious visible-wavelength AGN signatures, even though their X-ray luminosities are too high for their X-ray emission to be duedoi:10.1086/503521 fatcat:y4wz56nacvc65g4lnp5xnanrua