rank and file 
noun [treated as plural] (the rank and file)
The ordinary members of an organization as opposed to its leaders: the rank and file of the Labour Party [as modifier]: rank-and-file members...
- It cannot be said with certainty that such political moves benefited the rank and file.
- Panday has himself stated that this is a matter for the rank and file to decide.
- There is no burning desire by the rank and file members of a party to take part in the selection processes.
Synonyms
other ranks, soldiers and NCOs, lower ranks;
common/ordinary/private soldiers, soldiers, men, troops
ordinary members;
grass roots
Origin
Referring to the ‘ranks’ and ‘files’ into which privates and non-commissioned officers form on parade.