In a slow cooker, combine crushed tomatoes, diced tomatoes, tomato paste, tomato sauce, and kielbasa. Set slow cooker to High.
Heat olive oil in a large, deep skillet over medium heat. Cook onions, squash, green pepper, and garlic in oil until onions are translucent. Transfer vegetables to the slow cooker.
Place ground beef and ground turkey in a large, deep skillet. Cook over medium-high heat until evenly brown. Drain, crumble finely, and transfer to slow cooker. Season with bay leaves, peppercorns, basil, marjoram, thyme, and oregano.
Cover, and cook on High for 2 hours. Remove lid, and cook 1 hour more.
