Illegal or semi-legal newspapers, news sheets and journals may be published in opposition to the traditionally established press. Such periodicals may contain information of a politically or morally subversive nature, or even be actively anti-governmental.
The underground press may be the only means whereby injustices, inequalities and official hypocrisy may be exposed regarding pornography, homosexuality, discrimination (racial, ethnic, women, etc.), drug addiction, radicalism, war, sex, police brutality and similar issues.