I would want to see the beautiful, haunting German song Die Moorsoldaten/Peat Bog Soldiers included in the repertoire. The concentration camp subject matter would be entirely appropriate and the elements of defiance and optimism in the final verse would make it a valuable resource in times of adversity.
But perhaps I should have left this song for the likes of Wolfgang to claim.
Closer to (my) home, Paul Brady's song The Island would be a must. It comes closer to stating my personal credo about political conflict than any other song. Amazingly enough, the ironic lines "I know us plain folks don't see all the story, I guess peace and love's just copping out" lost him a lot of friends when he first sang it in the early 1980s.