Synergies - The glue of the group

I find it incredibly fascinating what kept these men together, what kind of “glue” helped them to not only stay alive but to be heard, understood and followed…

A word keeps popping up in my head: synergies

SYNERGY (plural syn•er•gies)
Combined effort being greater than parts.
The working together of two or more people, organizations, or things, especially when the result is greater than the sum of their individual effects or capabilities.
This gathering of efforts is mostly engaged by cultural similarities.