Airport Security Pre-1970-s?
Other airport questions have been answered here and the FAA seems to have been involved in early regulations so Id say this is in scope here. 

Airport security is a bit older than the 70's. The first serious criminal  aviation incident occurred in 1955 but hijacking has occurred since the dawn of aviation with cases being recorded as far back as 1930. The first serious increase in security appears to have come in 1961 (bolding my emphasis)  


  Antulio Ramirez Ortiz hijacks a National Airlines flight to Cuba after
  it takes off in Florida. It is the first aerial hijacking of a U.S.
  passenger plane.
  
  The U.S. government begins placing armed guards on commercial planes
  when requested by airlines or the FBI.


If you follow the citation in the metal detector wiki it sounds like the FAA started to make mandates in the early 70's following the DB copper incident but it clear things were happening before then.  


  But sky marshals couldn't ride on every flight, and the hijackings
  didn't end. So in December 1972, the FAA gave the airlines one month
  to begin searching all passengers and their bags. Dennis O'Madigan,
  then Director of Security for Piedmont Airlines, says metal detectors
  known as magnetometers were rigged up from a device originally used by
  loggers.


You should also keep in mind that in the earlier days of aviation ticket prices were extremely high and traveling via air was not as accessible as it is today thus some level of security was closer to what we see on private jets today. As ticket prices came down and the popularity grew greatly security became more of a concern.  

On a similar note airport security has varied over time around the world. El Al the flagship carrier for Israle has generally implements security well above what most others are doing.



As for your pictures, the first one is dated 1970 which is in line with the timeline following the slew of incidents in the late 60's and the FAA's mandate of metal detectors in 72. The second picture is a bit of a mystery, it could be mis-labeled or they could simply be asking about weapons leaving the country as Switzerland historically has fairly liberal firearm laws and many other countries do not. The third photo looks staged or like a special situation, you can even see another photographer in the background. The Woman may in some way be famous (I cant identify her) and appears to be posing. That also looks like an EKG or polygraph machine...