How can I find banned list of movies by each country

I don't believe IMDb tracks the nation-by-nation restrictions any detail more extensive than what Peter suggested above as a way to gather an idea about which movies are "banned" where. Some kind of scholarly whitepaper might outline the nuances of whether or not possession of a copy of a particular film is criminalized in a particular place, or whether or not rather merely commercial distribution of it is a civil infraction. Just to note, if any particular movie is banned in the United States, it would be because the federal judiciary (contrary to the first amendment to the constitution of the United States) concurred somehow with a prohibition put into place by at least one of the States or maybe a federal statute. I'm not aware the existence of any such categorical ban (let alone any such specific ban) that would apply to anything eligible for listing on IMDb, though.