Alex Jenkinson, 39, of Stowmarket, Suffolk, has been remanded in custody ahead of a court appearance.
Maldon & Tiptree owners Barrie Drewitt-Barlow and his husband Scott are remanded in custody.
Brian Campbell, 19, and Colm McGirr, 23, were shot dead after the SAS mounted an operation at the scene of an arms dump in December 1983.
One of Kerry Kershaw's victims was a 49-year-old man with learning disabilities.
The code is designed to protect the privacy of residents living near popular Fab Four landmarks.
John Rytting was serving a sentence after the death of Poppy Widdison in Grimsby in 2013.
