Red flag may refer to: Red flag (idiom), a metaphor for something signalling a problem Red flag warning, a term used by meteorologists Red flag (battle ensign), maritime flag signaling an intention to give battle with no quarter (fight to the death) Red flag (racing), used in auto racing when conditions are too dangerous to continue the session Politics Red flag (politics), a symbol of socialism, communism or left-wing politics Red Flag (magazine), a major political journal published by the Chinese Communist Party Red Flag Party, a communist party in Venezuela Peruvian Communist Party – Red Flag, a communist party in Peru "The Red Flag", a left-wing protest song written by Irishman Jim Connell in 1889 Red Flag (newspaper), an Australian left-wing newspaper published by Socialist Alternative Shimbun Akahata (Newspaper Red Flag), the newspaper of the Japanese Communist Party Red Banner Flag of the Soviet Union, known as "The Red Banner" Law Red flag law, a law that allows the temporary confiscation of firearms from a person deemed a risk to others or to themselves Red flag traffic laws Red Flag Act, properly, Locomotive Act, the 19th-century British road law Red Flags Rule created by the Federal Trade Commission (FTC) to help prevent identity theft Military Exercise Red Flag (also called "Operation Red Flag"), a series of military training exercises Red Flag – Alaska, a USAF military training exercise conducted in Alaska Film and TV "Red Flag" (Jericho) Red Flag, television series characters in Alphas Red Flag: The Ultimate Game, a 1981 TV movie starring Barry Bostwick "Red Flag", an episode of the television documentary series People's Century Music Red Flag (band), a synthpop band founded in 1984 Red Flag (album), a 2016 album by All Saints Songs The Red Flag, anthem of the British Labour Party "Red Flag Day", song from U2 album Songs of Experience Red Flag (Italian song) "Bandiera Rossa", one of the most famous songs of the Italian labour movement "Red Flag" (song), a song by Billy Talent from Billy Talent II "Red Flags" (song), a 2023 song by Mimi Webb The Standard of Revolt (French: Le drapeau rouge), a French socialist song "Red Flag", a song from Slipknot's album We Are Not Your Kind Other uses A red flag is used by a coach to signal a replay review in gridiron football Red flags are sometimes used (less often than in the past) on rail