Augusto José Ramón Pinochet Ugarte (] or ] ; 25 November 1915 – 10 December 2006) was a Chilean general, politician and the dictator of Chile between 1973 and 1990; he remained the Commander-in-Chief of the Chilean Army until 1998. He was also president of the Government Junta of Chile between 1973 and 1981. His rule of Chile was a dictatorship.
Ugarte was involved in politics before 1973.
It's possible that he was involved with politics before 1973, but it's also possible that he didn't become involved until later. The system may have been confused by the 1973 date.