The first 6 were much less friendly than the 7th. PR told them to disband after finding out they held radical racial beliefs about orcs. An investigation is currently underway to determine whether the 7th Legion has fallen into that category.
Oh the results are here.
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So, while they’re not tied to any radical groups, it would appear the 7th Legion is responsible for multiple war crimes. Way to go, Alliance!!! Garrosh would be proud if he saw what you guys did in BfA.