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 and MACS J0717.5+3745. 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.