Big Huge Important Point #1
People are going to grumble about this government. People are going to eventually look for ways to strike at the government. Have a government arm established to represent and recruit for the resistance. Have it send out missions to partisans, some of which are designed to be successes, some designed to be failures. Train and hone operatives as agents against the state, and when they are ready, give them a difficult solo mission only to have it turn bad against them and reveal to them that there is no resistance; reveal to them that it was the government training them the whole time. Offer them positions as an agent with the government; kill those that refuse.
You will effectively quash resistance against your rule by supplying the outlet for rebellious feelings.
Big Huge Important Point #2
Unless you want to have a "this is the government, they are evil, end of story" campaign, make this facist government Lawful in the extreme and unafraid of Evil measures, but don't make it a recklessly malicious government.
If the government enforces laws harshly, also highlight that the laws provide a safe and increasingly wealthy and comfortable society. If the government represses people, highlight that its repression is systematic and not random: actual conspirators against the government are arrested, not because they institute pogroms against left-handed red-heads. If the government maintains a police force who deals with law-breakers violently and often holds public executions, highlight that the cities are very safe, and the murder of and theft from law-abiding citizens almost unheard-of. Endeavor to note that those people who were disappeared were not innocent of conspiracy against the government. Note that law-abiding citizens can lead prosperous and unmolested lives. The PCs will want a moral leg to stand on. Don't give it to them.
Make Lawful government the opposition of your PCs instead of Evil government. It makes things ever so much more interesting. Especially when most of the population doesn't really want a change in the status quo, and those that do are busy being recruited by the government's own Ministry of Rebellion.
Besides, if society is prosperous you'll have a ready reason why there hasn't been a general uprising and won't have to explain exactly where this facist government gets the money for all these privacy invasions: they get it from the willingly-paid tax revenues collected from a bustling business sector.