Friedrich Engels, 1820 –1895 CE, was a German philosopher, social scientist and journalist. Karl Marx, 1818 –1883 CE, was a German philosopher, economist, historian, political theorist, and revolutionary socialist. Born to a middle-class family, Marx studied law and philosophy.

Amílcar Lopes Cabral; 12 September 1924 – 20 January 1973 was a Bissau-Guinean and Cape Verdean agricultural engineer, political organizer, and diplomat. He was one of Africa's foremost anti-colonial leaders. He was also a pan-Africanist and intellectual nationalist revolutionary poet.