What does “cunning, ambitious, and unprincipled men” who would “usurp for themselves the reins of government; destroying afterwards the very engines, which have lifted them to unjust dominion.” mean in George Washington's farewell letter?

George Washington Farewell Address. ... by which cunning, ambitious, and unprincipled men will be enabled to subvert the power of the people, and to usurp for themselves the reins of government; destroying afterwards the very engines, which have lifted them to unjust dominion.

I believe it is because they are enforcing laws and they are part of the U.S. after all

Explanation: