Answer :
President Nixon ordered the raiding over the Brookings Institute to bring formal changes into the American ways of governance.
What did President Nixon do?
President Nixon was determined to bring changes into the American society, by promoting the welcome of democracy in the country.
In order to plug the leaks of the Pentagon Papers, Nixon ordered the plumbers with the task of doing so.
Hence, in order to bring safety, Brookings Institute was raided by President Nixon for several times.
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