What tactics did Senator McCarthy use during the Senate Committee hearings?
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In February 1950, Senator McCarthy charged that there were over 200 “known ... in early 1954, he charged that the United States Army was “soft” on communism. Government Operations Committee in the Senate, opened televised hearings. Toxic smoke had been used occasionally in warfare since ancient times.

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congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make 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.