Word/phrase for country's Ideology /political syst., whose governing bodies keeps tight control on media, on leak of info regarding mishandling

Solution 1:

I suppose you are looking for this word

Fascism

a. A system of government marked by centralization of authority under a dictator, a capitalist economy subject to stringent governmental controls, violent suppression of the opposition, and typically a policy of belligerent nationalism and racism.

b. A political philosophy or movement based on or advocating such a system of government.

  1. Oppressive, dictatorial control.

[American Heritage Dictionary]

I offer another candidate because your question depicts an Orwellian state of affairs

Big Brotherism

Authoritarian efforts at total control, as of a person or nation: “the frightening totalitarian Big Brotherism that launched the privacy scare” (Newsweek).

[AHD]