YouTube shut down the far-right Portuguese ultranationalist Grupo 1143’s video channel after a news article highlighted its extremist content. The online video-sharing platform said on Tuesday it blocked the account for violating its policy against hate speech after a New York Times piece took a closer look at social media posts assailing immigrants and cited examples in the UK, Portugal, and other countries where the “vitriolic language is now spilling onto the streets.” Grupo 1143 is led by Mario Machado, a neo-Nazi activist whose anti-Islam and anti-migrant campaigns have been gaining atten…