BROLGA is a proposed large survey science project for the Australian SKA Pathfinder (ASKAP). The aim of BROLGA is to carry out sensitive and large-scale observations of nearby galaxy groups and clusters in both the 21-cm line of neutral hydrogen as well as radio continuum emission. The survey will allow us to study the effects of structure formation, galaxy evolution, and feedback processes in group and cluster environments in unprecedented detail. Major scientific goals of BROLGA include (1) the study of tidal interaction and accretion in group and cluster environments, (2) search for unknown and dark satellites, (3) study of the cosmic web in HI and radio continuum, (4) determination of the structure and dynamics of galaxies in groups and clusters, (5) study of mechanisms to induce or suppress star formation in galaxies, and (6) study of magnetic fields in galaxies and their environment. I will introduce the basic observational parameters of BROLGA and then motivate the different science drivers and discuss their impact on our current understanding of galaxy evolution and feedback mechanisms between galaxies and their environment.