I am so sorry @BlessedWithGoats this is just too many to be coincidental. I really hope you can get a necropsy done. While your one goat died from a ruptured abscess on the liver that abscess is often secondary to another infection. Have your goats been tested for CL? But I seriously doubt that CL would kill 3 goats this close together as it is not commonly a disease they die from. If you can get a necropsy and it ends up being something like pneumonia make sure they find out what bacteria is present.
I would look at parasites or pneumonia. And I would also look at their minerals and their selenium and copper levels. Minerals can play a big part in keeping other problems at bay.
Again, I am so sorry this is happening, very very sad.
Thank you everyone, for all the help, suggestions, and condolences.
The vets office took Basil in for a necropsy; the vet called this morning and stated it was liver flukes. I am planning on treating with Ivermectin Plus in the morning, after I call to confirm the dosages. Thank you @Southern by choice again for your insight into the dosage amounts.
Did your goats have coughs? I know you said they had pneumonia. The reason I ask is I was just reading in my Goat Medicine book that they can sometimes migrate to the lungs, which I did not know.