Which independence leader most likely said the following at the beginning of June 1961 after a long and anxious assessment of the south African situation I am some colleagues came to the conclusion?

The statement you referenced is most likely attributed to Nelson Mandela. In June 1961, Mandela and other leaders of the African National Congress (ANC) were assessing the political climate in South Africa, leading to the establishment of Umkhonto we Sizwe, the armed wing of the ANC. This marked a significant shift in their approach towards fighting apartheid, as they recognized the need for armed resistance after years of peaceful protests. Mandela's leadership during this period was pivotal in the struggle for South African independence.