At the center of most galaxies lies a supermassive black hole. They are millions to billions times more massive than our Sun. When they consume surrounding material, they produce powerful “jets” of radio plasma. The ngVLA will peer deep into the heart of galaxies to study how these jets interact with the surrounding gas and dust. These observations will help us understand how suermassive black holes influence star formation and ultimately the growth and evolution of galaxies over cosmic time.