Wikipedia
A group mind, hive mind, group ego, mind coalescence, or gestalt intelligence in science fiction is a single, collective consciousness or intelligence occupying many bodies or entities. Its use in literature goes back at least as far as Olaf Stapledon's science fiction novel Last and First Men (1930). A group mind might be formed by telepathy, by adding brain-to-brain communication to ordinary individuals, or by some unspecified means. This term may be used interchangeably with "hive mind". A hive mind is a group mind with almost complete loss (or lack) of individual identity; most group minds are hives. The concept of the group or hive mind is an intelligent version of real-life superorganisms such as an ant colony or beehive, and consequently, insectoid aliens such as Zerg and Ceph often have such a mind.
Usage examples of "group mind".
More importantly, it maintained its linkage with ColdLakePromontory back on the planet, remaining part of the group mind.
Many people who 'did there bit' felt they were linking into a group mind that had the power to make people listen and take note.
Within a few seconds, the group mind of countless individual bird folk would be in possession of parts of his nervous system.
I could see that in their group mind I was becoming rated as one hell of a fellow, a quick guy with a buck, a citizen who could handle his liquor, keep his mouth shut.