I really know nothing about those guys other than that I will never try to pronounce their names.
I got the name of the first one slightly wrong...
Good old Wikipedia:
Francisco Macías Nguema.
Wikipedia has very little on Lucas and the History of Guatemala article is rather biased - Montt's regime was NOT the most violent in the Guatemalan civil war, for why else would the Mayan countryside VOTE for him in actual free elections?!
Suffice it to say that Romeo Lucas was the bastard mostly responsible for the genocide against the Mayans in Guatemala - despite revisionist attempts by left and right alike to put all the blame on Montt.