That's not what the quote said.
Re-read it.
As pointed out earlier, at the time of the quote he was an official in the communist-leaning Sandanista gov't(supported by the USSR and closely aligned with Cuba) and the context was him claiming that the Sandanista's leftist movement would expand to threaten their enemy the US via such underground immigration. Sorry, but almost none of these illegal aliens are coming here for such reasons, that's ridiculous. And the Aztlan crowd is a small, insignificant, but vocal group of nuts. The KKK still exists, but does that mean that all Southerners who migrate to other states are on a secret mission to kill Blacks? Gimme a break.