They may be bitter

• Minutemen and Redcoats, e.g.
• Those at swords' points
• Shinedown song about foes
• Opposed combatants
• Those to keep closer
• Members of the Legion of Doom, to members of the Justice League
• _____ list
• All the people attacking you
• The Blue and the Gray, e.g

Wiktionary Word definitions in Wiktionary
n. (enemy English)