NEAR MALKO TARNOVO, Bulgaria — Figures in camouflage and ski masks gather at a fishing lodge. Many are armed with long knives, bayonets and hatchets.

The 35 men and women are on the hunt in Strandzha Massif, a forested mountain range on Bulgaria's border with Turkey. Migrants trying to cross into Europe are their prey.

Patches on their irregular uniforms — a coat of arms bearing a snarling wolf's head framed by Cyrillic text — proclaim them to be members of the Bulgarian National Movement Shipka, abbreviated in Bulgarian as "BNO Shipka."