Advice for categories for Bay of Lübeck Disaster [closed]

Question

I would like advice or may need help creating a new category for the profile of Evert de Jong. The category might be named something like 

• Subcategory of Holocaust
• with subcategories 
  • Cap Arcona 
  • Thielbek
  • Athen

Please see Floating concentration camps in the Bay of Lübeck for the story

Could I get help creating the new categories? Or is there an existing category to use? Thank you!