In 1978, Mbeki became political secretary in the office of Oliver Tambo. He became a close confidant of Tambo, advising him on all matters and writing many of his speeches. One of his duties as secretary was to choose a theme each year in accordance with the ANC's current activities – 1979, for example, was known as "The Year of the Spear", while 1980 was "The Year of the Charter." From 1979, with Mbeki as his right-hand man, Tambo began building up the guerrilla movement into an internationally recognised guardian of South African freedom.