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It was the worst rioting Tokyo had seen since 1960, when the Zengakuren prevented President Eisenhower's state visit to Japan and toppled Premier Kishi. But even then, though much more unified and with far more public support than today, Zengakuren could not prevent the signing of the U.S.-Japanese Security Pact. The pact, replacing the earlier Security Treaty of 1951, was signed in 1960. It actually gives Japan a greater voice than before in any U.S. military activities on Japanese territory, and pledges both countries to take unspecified action if either one is attacked in territories under Japanese administration. It is scheduled to be reviewed in 1970, and either nation can withdraw from the pact by giving a year's notice of such a decision. What is much more likely to happen is that neither Washington nor Tokyo will do anything —in which case the pact will remain automatically in effect.