Growing protests are raging across Iran despite an unforgiving crackdown and threats following the death of 22-year-old Mahsa Amini. Iran’s president issued a warning saying authorities must “deal decisively with those who oppose the country’s security and tranquility.” According to state media, 41 Iranians have been killed since the protests began. But women, who are at the heart of this protest, continue defying the authorities, burning headscarves, cutting their hair, and walking in the capital's streets without a hijab in defiance. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: https://apps.nbcnews.com/mobile Breaking News Alerts: https://link.nbcnews.com/join/5cj/breaking-news-signup?cid=sm_npd_nn_yt_bn-clip_190621 Visit NBCNews.Com: http://nbcnews.to/ReadNBC Find NBC News on Facebook: http://nbcnews.to/LikeNBC Follow NBC News on Twitter: http://nbcnews.to/FollowNBC Follow NBC News on Instagram: http://nbcnews.to/InstaNBC #Iran #Protests #World