rauhanoppositio (englanniksi)

In the Finnish history (s: historical)
group of politicians who (s: historical)
towards the end of WWII were working for concluding a separate peace treaty with the Soviet Union (s: historical)
usually translated as peace opposition into English (s: historical)
Any opposition group in any country which works for peace (s: by extension)
either in order to end an ongoing war or to prevent a threatening war (s: by extension)