GREAT ATTRACTORS AT HIGH REDSHIFTS

We argue that the majority of QSOs at z less than or similar to 2-3 fo rm in merging and interacting galaxies produced during the first gener ation of matter crossings which occur in galaxy protoclusters. Groups of quasars (QGs) with a few or more than a dozen members, within compa ct regions of less than or similar to 100 h-1 Mpc found at z less than or similar to 1-2, may belong to concentrations of young clusters of galaxies, and thus indicate the locations of enhanced-density regions (GA progenitors) which develop later into quasi-linear systems like th e local Great Attractor (GA) or Shapley Concentration. These early lar ge-scale galactic structures (LSSs) (i) provide a natural way to 'bias ' the distribution of Abell clusters, and (ii) suggest that the spectr um of primordial density perturbations is nearly flat at scales encomp assing both clusters and GAs, l = pik-1 is-an-element-of (10, 100) h-1 Mpc: DELTA(k)2 approximately k3P(k) approximately k(gamma), gamma = 1 (+0.6/-0.4), where P(k) is the power spectrum of density perturbations .