This has been covered before, you should try the search function.
However, what you need to do is group your civilians with an East ( or West) officer.
Then they will be on the East (or West) side.
Next you need to put:
deletevehicle this
in the officers initialisation filed.
When you start the mission, the officer won't be there he is deleted, but the civvies think they are East (or West).
In your case, you should group them to the Resistance and make Resistance friendly to nobody.
Hope that helps
Planck