Vikings captured people to sell as slaves in trade markets.

Evidence

But this trade route also carried the dark side of the Vikings’ reputation. All through eastern Europe, Vikings captured people to sell as slaves in the great market of Kiev – which explains why in so many European languages the words for ‘slave’ and ‘Slav’ are still closely connected. — Neil MacGregor, A History of the World in 100 Objects, 897

Categorization

• corroborated: 2 independent passages support this claim — Neil MacGregor, A History of the World in 100 Objects, 897
• XREF: connects to: Viking raids resulted from their population growth and quest for adventure. — Winston Churchill, A History of the English-Speaking…, 162; French officials sold arrested black soldiers back into slavery

Broader Connections

• French officials sold arrested black soldiers back into slavery #exemplifies (0.55)