Martin_Luther_King,_Jr. like JFK, could have been quite instrumental in redirecting government & corporate interests from supporting & profiting from the Vietnam_War industry.
1967-4-4
http://en.wikipedia.org/wiki/Beyond_Vietnam:_A_Time_to_Break_Silence
Then the Assassination of Martin_Luther_King,_Jr. was on 4-4-1968.
"The original World Trade Center featured landmark twin towers, which opened on April 4, 1973..."
http://en.wikipedia.org/wiki/World_Trade_Center
http://www.nydailynews.com/new-york/world-trade-center-40th-anniversary-gallery-1.1307674?pmSlide=1.1307653
http://www.nydailynews.com/new-york/world-trade-center-40th-anniversary-gallery-1.1307674,
http://www.businessinsider.com/the-world-trade-center-40th-anniversary-2013-4
The Space_Shuttle_Challenger's first flight was on April 4, 1983.
http://patternsofsynchronicty.blogspot.ca/2014/01/space-shuttle-challenger-disaster-1986.html
http://www.awakeninthedream.com/wordpress/catching-the-bug-of-synchronicity