I think this might convey the sense. I always think using "solidarity" is a bit of a risk in this context as it is something particular to Latin languages, but not really with English.

Or "community support network", which of course borrows from Lara's post.

I would avoid solidarity. In Italian it is closely connected with charity and the English cognate was affected in this direction with Pope Wojtyla and the Solidarnosc connection. However I feel its core meaning in English (at least for my generation) is still connected with trade unions and picket lines.