The government coverup of the Chernobyl disaster was a "catalyst" for glasnost, which "paved the way for reforms leading to the Soviet collapse".

Katzenbach's memo comes the closest of any known official document (Katzenbach's memo) to discussing a government coverup :

After decades of government coverup, this incident, referred to as the Nedelin disaster, was finally revealed.

So-called "truthers," who believe in a government coverup, have produced scores of Web sites, as well as several books and documentaries explaining their conspiracy theories.

Which is why some of you are most interested in reading about a high-ranking government coverup of alien experiments on pregnant human women.

Proof positive that this is the site of a massive government coverup.

The film challenged the mainstream news reports of the Branch Davidian siege and created a small sensation, alleging a government coverup of the events surrounding the siege.

His pod was found and he was awakened 60 years prior her and he was forced into the government coverup of their prior life.

And I started getting conspiracy calls - people thinking it was a government coverup.

Grassley and Issa "urged Holder to cooperate and turn over subpoenaed records that would reveal the scope of the government coverup."