Why did some governments support terror groups?

Most governments probably support terror groups because members of the terror groups or leaders of it are probably in the government

Explanation:

Hope this help

From,

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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.

north atlantic treaty organization.