Formation and Evolution of
Galaxy Clusters Across Cosmic Time

ClJ1449+0856, a galaxy cluster at z=2, is an exemplary case to investigate everything from galaxy evolution in dense environments, to early-time energetic feedback in clusters, and the physics of the high-redshift intra-cluster medium (ICM). Despite its early epoch, ClJ1449 has now been detected in both diffuse X-ray emission and through the thermal Sunyaev Zel'Dovich effect - the lowest mass single SZ detection to date. Having uncovered a diverse galaxy population in ClJ1449, including highly-excited, merging, star-forming galaxies, we now turn our attention to the excess radio emission at 3GHz. We discover multiple faint radio-jet emission sites in the cluster core - quite unlike the picture in local galaxy clusters. We explore the implications of this kinetic feedback for energy injection into the ICM, its relation to the SZ signal, gas accretion, and the infrared-radio correlation in dense environments.