 During its existence , the Select Committee conducted 253 active investigations , served 8 @,@ 000 subpoenas for witnesses and documents , held 270 days of hearings with 1 @,@ 526 witnesses ( 343 of whom invoked the Fifth Amendment ) , compiled almost 150 @,@ 000 pages of testimony , and issued two interim and one final report . At its peak , 104 persons were engaged in the work of the committee , including 34 field investigators . Another 58 staffers were delegated to the committee by the Government Accounting Office and worked in Detroit , Chicago , New York City , and southern Florida . To accommodate the huge staff , a corridor was blocked off in the Old Senate Office Building and turned into a suite of offices . 
