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"If You Want Peace, Study War" the groups I heard about that adopted that or similar motto were all aggressive and originators of the violence.

Can you elaborate which such groups?

A mafia/crime organization had it tattooed. They were violent.

Also, I read about military group having that logo, it was written about due to crossing the lines.

They only say the name of the group when they have a comfortable majority.

The Genius of the Crowd.