@tim Hi Tim. As I, and others on union.place are from the UK, whilst I can't speak for all, I think the following would be very helpful:

#TUC
#OrganiseNow!
#Unite
#Unison
#GMB
#RCN
#NEU
#USDAW
#CWU
#PCSU
#BMA
#Prospect
#UCU

I'm sure you recognise most, if not all, of these. If you have any issues with my suggestions please let me know.

Many thanks,

Dave