High redshift galaxy clusters with ongoing star formation. The first two color composite images show ACT-CL J0431.0-3236 (z = 1.54, SNR=5.1) in optical g, r, z-bands (left most image) and in WISE w1, w2-bands (second from left). The third and fourth images show the same optical and WISE images for ACT-CL J1240.4+0534 (z = 1, 8, SNR=5.3). While the BCGs are visible for both clusters in optical and WISE, we see an unusually high concentration of blue galaxies near the cluster core.