Sentence:  His proposal is opposed to that of Richard Nixon , Governor Rockefeller , <WSD>past</WSD> chairmen Strauss and McCone of the Atomic Energy Commission , Dr. Edward Teller and those others now enjoying their hour of triumph in the exacerbation of the cold war . 
Meaning of the word marked with <WSD> tags:  of a person who has held and relinquished a position or office