Foreign magazines and newspapers were sometimes seized and not delivered to subscribers, usually when they included articles about domestic politics in Taiwan. (I learned to respect The Economist as a news source by observing how often it was seized in delivery, either in entirety, or with blacking out of particular articles.) Local people who could read English could pay their hard-earned money to subscribe to (rather expensive, in those days) publications like The Economist or the Asian edition of the Wall Street Journal, but they couldn't count on receiving all of what they paid for.
The dictatorship in Taiwan eventually fell, after a largely peaceful people power revolution that forced a transformation to an open political system. Along the way, people I know, including the father of one my children's godparents, were imprisoned for leading peaceful protests urging free and fair elections and a stop to censorship. Most people don't have the courage to go to prison--especially prisons like those in Taiwan at the time. But courage is what it takes to undermine a dictatorship. A successful movement for greater freedom requires great courage, and a degree of social trust among the movement participants that is not easy to find. Allow me to repeat advice I have shared here on Hacker News before. If you really want to be an idealistic but hard-headed freedom-fighter, mobilizing an effective popular movement for more freedom wherever you live, I suggest you read deeply in the publications of the Albert Einstein Institution,
http://www.aeinstein.org/organizationsde07.html
remembering that the transition from dictatorship to democracy described in those publications is an actual historical process with recent examples around the world that we can all learn from. Practice courage and practice collective action.