- Abstract Structure growth in the universe is one of the fundamental astrophysical problems. Merging galaxy clusters are the perfect laboratories to study the effects of structure growth on the thermal and the non-thermal particle populations in the ICM. I will present results from recent deep Chandra observations of the merging HST Frontier Clusters MACS J0416. 1- 2403, MACS J0717. 5+ 3745, and MACS J1149. 5+ 2223. I will talk about multiwavelength evidence for shocks and turbulence in the ICM, and discuss the constraints set on the merger geometries by optical, X-ray, and radio data.