https://www.siliconvalley.com/2020/06/18/facebook-takes-down-trump-ads-for-violating-our-policy-against-organized-hate/

Facebook on Thursday said it had take action against ads run by President Trump’s re-election campaign for breaching its policies on hate. The ads, which attacked what the Trump campaign described as “Dangerous MOBS of far-left groups,” featured an upside-down triangle.

The Anti-Defamation League said Thursday the triangle “is practically identical to that used by the Nazi regime to classify political prisoners in concentration camps.”