text: Upon Tun Abdul Razak 's death in 1976 , the post of prime minister was taken up by Datuk Hussein Onn , a son of the founder of the UMNO .
  
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  Tun Abdul Razak 's death in 1976 was due to being poisoned , after which Datuk Hussein Onn , a son of the founder of the UMNO , became prime minister .