While I'm not sure all encompassing, and additional actions may happen without much advance notice, this Italy MIT website lists scheduled transit strikes. They are listed as national, regional or local and give dates and times of strikes. Also indicated is the mode(s) of transport affected. Again, while not an absolute list of all strikes that may happen during a visit, it might be useful to know those scheduled in advance to help in planning your visits to Rome. I'm hopeful cruisemom42 will post here with her wealth of knowledge of how useful this site is and any other information that might help when dealing with strikes (sciopero).