an interim report titled "Alleged Assassination Plots Involving Foreign Leaders", which investigated alleged attempts to assassinate foreign leaders, including Patrice Lumumba of Zaire, Rafael Trujillo of the Dominican Republic, Ngo Dinh Diem of South Vietnam, Gen. René Schneider of Chile and Fidel Castro of Cuba. President Gerald Ford urged the Senate to withhold the report from the public, but failed, and under recommendations and pressure by the committee, Ford issued Executive Order 11905 (ultimately replaced in 1981 by President Reagan's Executive Order 12333) to ban US sanctioned assassinations of foreign leaders. In addition, the committee produced seven case studies on covert operations, but only the one on Chile was released, titled "Covert Action in Chile: 1963–1973". The rest were kept secret at CIA's request. According to a declassified National Security Agency history, the Church Committee also helped to uncover the NSA's Watch List. The information for the list was compiled into the so-called "Rhyming Dictionary" of biographical information, which at its peak held millions of names—thousands of which were US citizens. Some prominent members of this list were Joanne Woodward, Thomas Watson, Walter Mondale, Art Buchwald, Arthur F. Burns, Gregory Peck, Otis G. Pike, Tom Wicker, Whitney Young, Howard Baker, Frank Church, David Dellinger, Ralph Abernathy, and others. But among the most shocking revelations of the committee was the discovery of Operation SHAMROCK, in which the major telecommunications companies shared their traffic with the NSA from 1945 to the early 1970s. The information gathered in this operation fed directly into the Watch List. In 1975, the committee decided to unilaterally declassify the particulars of this operation, against the objections of President Ford's administration. Together, the Church Committee's reports have been said to constitute the most extensive review of intelligence activities ever made available to the public. Much of the contents were classified, but over 50,000 pages were declassified under the President John F. Kennedy Assassination Records Collection Act of 1992. Committee members Opening mail The Church Committee learned that, beginning in the 1950s, the CIA and Federal Bureau of Investigation had intercepted, opened and photographed more than 215,000 pieces of mail by the time the program (called "HTLINGUAL") was shut down in 1973. This program was all done under the "mail covers" program (a mail cover is a process by which the government records—without any requirement for a warrant or for notification—all information on the outside of an envelope or