So most of you will know that this month will be 20 years since the Tianamen Square protest, where thousands of students from Beijing gathered within the square calling for reform within the government, along with similar gatherings across China. Following the death of Hu Yaobang, a politically progressive politician. This galvanised the surrounding community, who chimed in with the words of the students, whose demands became increasingly radical (within the eyes of the government).
The response from the Chinese government?... to send in the army, which resulted in masses (in all probability thousands, but that information is withheld) of deaths of civilians. International response was almost universal in condemnation of the governments actions (apart from North Korea, Cuba, etc.), along with this image becoming iconic of resistance against corrupt authority;
And yet even today it's government tries to wipe the event from the history books and from the memory of it's people. With widespread censorship of the affair, from news reports, newspapers, to even the internet. (Though the English language Wikipedia article of the event is no longer banned from China since April. Though the Chinese language one still is.)