Rabbi (and attorney) David Avigdor is/was the rabbi at the Congregation Bikur Cholim Sheveth Achim synagogue in New Haven. I'm sure that you're aware that he also had some legal problems here in New Haven. You might try to contact him through the synagogue:
112 Marvel road
New Haven CT 06515
BTW, although I never knew any of the Avigdors well, I did meet David several times in New Haven, knew his father, Rabbi Isaac in Hartford, CT and way back in 1960 I had occasion to meet Rabbi Jacob Avigdor in Mexico City.
Good luck and stay well,
New Haven, CT