underground press
periodicals and publications that are produced without official approval, illegally or against the government
en-GB/ˈʌndəɡɹaʊnd ˈpɹɛs/
en-US/ˌʌndɚˈɡɹæʊnd ˈpɹɛs/
periodicals and publications that are produced without official approval, illegally or against the government