The D'Anna brothers are either the nephews or cousins (I believe cousins) of early Detroit powerhouse Anthony (Tony Cars) D'Anna, who was a top figure serving under Joe Zerilli dating back to the 1930s era. Tony was a highly-respected guy.
I did a piece on him several years ago. Here it is...
Anthony (Tony Cars) D’Anna
https://thenewyorkmafia.com/anthony-tony-danna-detroit-mafia-star/In fact, D'Anna is largely credited with having been the one who first secured the pact with Ford Motor Car Company and several other major Detroit auto manufacturers which over the years brought untold millions into the coffers of the Detroit Partnership.
Hence his nickname, "Tony Cars"