Brown the ground beef and sausage, breaking up the clumps of meat while you stir.
Add the onions, garlic and mushrooms and cook until softened, about 10 minutes.
Put the meat and vegetables into the crockpot and Stir in the tomatoes and their juices, tomato sauce, tomato paste, basil, oregano, sugar, salt and red pepper flakes.
Turn the crockpot up to high and bring to a simmer, then turn it down to low for 3-4 hours.
If you're adding the red wine, stir it in about half an hour before serving the sauce.
Serve over cooked pasta with grated Parmesan.
Notes
This easily served 8 with 1 pound of pasta with plates that were heavy on the sauce and light on the pasta, with about 2 cups of sauce left over.