The committee of correspondence was

Shadow Governments pre-American Revolution

Explanation:

The Committees of Correspondence were shadow governments prior to the Revolution that debated the issues of the day and worked to bring America closer to rebellion.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.