cartel

A group of businesses or nations that collude to limit competition within an industry or market.

oil cartel

drug cartel

A combination of political groups (notably parties) for common action.

A written letter of defiance or challenge.

He is cowed at the very idea of a cartel.

Xerxes whipped the Sea, and writ a cartell of defiance to the hill Athos.

An official agreement concerning the exchange of prisoners.

He then sent down a flag of truce in military style, proposing a cartel or exchange of prisoners – the corporal for the notary.

A ship used to negotiate with an enemy in time of war, and to exchange prisoners.