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The Flag Smashers are comprised of people from disadvantaged nations who benefited immensely from the Snap. The background is that people from the developing world were allowed to migrate into suddenly vacated space in the developed world to provide additional labor and allow those nations to remain at roughly the previous level of economic output they had pre-Snap due to immigration restrictions being functionally eliminated (it's implied that this did not happen in the US, mitigating the issue there).