How does the Capitol use the Hunger Games to control the Districts?

In the novel The Hunger Games, the
Capitol uses the games to control the people of the
Districts.

The main reason the Capital can use the games to
control the people of the Districts is fear. The people of the Districts are fearful
that if they revolt against the Capitol, in protest of the Games, that the Capitol will
destroy their respective districts as they had in the past with District
Thirteen.

The Capitol uses District Thirteen to remind the
other districts that they hold and maintain power given they can destroy any district at
any time.

Another way the Capitol could maintain power over
the districts is by withholding supplies from them. While this is not stated in the
first novel, is is certainly inferred by the way the people are fearful of losing the
supplies that they need to survive. As one gets further from the Capitol, it is apparent
that the districts become poorer. The Capitol uses this fear to suppress any revolts
which may come about as a result of protesting the games.