NASA

NASA, the most famous and biggest space organization knows everything about aliens. It has a great contact with aliens and has many Top Secrets hidden. One witness is that when Neil Armstrong, the first person to step on the moon when there, he left some clues of their visit in some way that told the date and related information of the visit which meant for Aliens. As NASA is in America, which is one of the favorites of Aliens to visit at, most alien incidents occur in America. NASA says "We will be connected to aliens within 20 years" officially in newspapers and media. NASA provides help to aliens also. NASA is also a very secret research center. 

Nikola Tesla

Nikola Tesla, the great scientist, contributed a lot for today's science. He invented many very important things which are necessary today. One of them was electricity. He worked under Thomas Alva Edison. Edison discovered direct current which flew for a very short distance but Tesla discovered alternate current which could move kilometers away. This is how electricity is used now. He wanted to invent Anti-Gravity air crafts which would run on wireless electricity. He made a wireless radio wave tower which supplied electricity kilometers away. He made a radio wave antenna which could catch radio signals. Once one Alien signal was caught by the antenna also. Tesla was not so famous because all the others thought him to be mad. He invented 'Death Beam' which would be a weapon for American Government. Death beam could shoot targets in the air and destroy foreign air crafts in the air only. After his death, in the Hotel New Yorker, all the documents and inventions were taken up by FDI. As said by Ancient Aliens's episode yesterday, these dreams may be sent by the Aliens for the promotion of the World's technology through Tesla. Tesla was somehow connected by aliens and they sent him commands which he followed. This is why all the documents were taken by the FDI. The Iron Beam was brought up by Israel whose idea may be taken by the Death Beam of Tesla. Nikola Tesla was also an example of the Alien existence.