These are all Massachusetts bonds. You can ask about insurance when you talk to a broker. A deep blue state like Mass backs their bonds cause they have an endless supply of dupes who keep raising their own taxes. I would be careful about states like CA & IL.
Thanks for the info, my son is my bond broker, I never asked about the insurance - I usually buy NY munis because it’s my home state.
I wouldnt buy IL or CA with someone else’s money :)