The availability of ground and space-based telescopes collectively covering much of the electromagnetic spectrum have enabled exciting multi-wavelength views of luminous infrared galaxies in the local Universe. These galaxies are powered by interaction and merger-induced star formation and AGN activity, and there is growing evidence of feedback which likely plays a role in regulating the fueling of both phenomena. In this talk, I will motivate the need for the increase in sensitivity and resolution delivered by the next generation of telescopes, especially those at radio to FIR wavelengths, to diagnose the physical processes at work in these extreme starburst systems at the scales of 10s of parsecs.