An ominous symbol has completely saturated the state funeral of late Supreme Leader Ali Khamenei. Hundreds of thousands of mourners packing the Imam Khomeini Grand Mosalla in Tehran were seen waving massive red flags bearing the adapted Shia slogan "Ya Latharat al-Khamenei"—or "O Avengers of Khamenei.

Thousands of mourners flooded the streets of Tehran on Monday as the funeral procession for Iran’s late Supreme Leader Ayatollah Ali Khamenei moved through the capital, with calls for revenge against ...