@ScrapHappy I was just going to post a similar message about "if you see something, say something" (to the authorities), but you used a phrase just like that with "if you hear something, say something."
Unfortunately, too many people live by the term "NIMBY" ("not in my back yard") and don't always get involved when necessary.
If there is yelling in the home (especially with children present and/or children living in the residence), then calling the local police department seems like a good and prudent next step. No one really knows if the yelling or shouting may escalate to a physical altercation and/or the emotional damage from that. I agree with others to call CPS, too, if minor children (under 18) may be in the home.
The Childhelp site has a toll-free 24/7 helpline for those who suspect child/teen abuse or neglect.
The National Domestic Violence Hotline site has a toll-free 24/7 helpline and related resources, especially for those in an abusive situation with an intimate partner.