Part of overt,
Part of the government , which holds the government dictatorship or win the election.
Part of covert,
The part which is behind the wall and controlled the overt part.
The covert part supports the overt part with money and power.
The covert part in Western countries is from the inside , but in the colonial countries like the Gulf countries , Egypt and Jordan are from the covert part of the colonial countries.
In the popular governments has no covert part, and overt part is the real part of government.