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Increased power of the Convention People's Party

In 1962, three younger members of the CPP were brought up on charges of taking part in a plot to blow up Nkrumah's car in a motorcade. The sole evidence against the alleged plotters was that they rode in cars well behind Nkrumah's car. When the defendants were acquitted, Nkrumah sacked the chief judge of the state security court, then got the CPP-dominated parliament to pass a law allowing a new trial. At this second trial, all three men were convicted and sentenced to death, though these sentences were subsequently commuted to life imprisonment. Shortly afterward, the constitution was amended to give the president the power to summarily remove judges at all levels.

In 1964, Nkrumah proposed a constitutional amendment that would make the CPP the only legal party, with Nkrumah as president for life of both nation and party. The amendment passed with 99.91 percent of the vote, an implausibly high total that led observers to condemn the vote as "obviously rigged". Ghana had effectively been a one-party state since independence. The amendment transformed Nkrumah's presidency into a de facto legal dictatorship.