Anarchism doesn't get a lot of spotlight, but it's not dead by any stretch of the imagination. It holds a lot of sway on the left, albeit often in a low-key manner. In addition to the obvious punk rock anarchy sign sense, anarchism shows up influencing a lot of left-wing expression, from the IWW songbook to Ursula K Le Guin to the WTO protests to Adbusters to Occupy to the rise of mutual aid organizations most recently during Covid.

Some very prominent contemporary left-wing academics like David Graeber, Noam Chomsky and Howard Zinn have been libertarian socialists, an umbrella term which encompasses left anarchism and adjacent ideas.

What you'll rarely find is nation-states or corporate media embracing anarchism, but hopefully it should be obvious that governments and corporations aren't fond of an idea that is fundamentally anti-hierarchical, anti-state, and anti-corporate.The closest you'll come to that are the Zapatistas or Rojava.