The Harry Ransom Center at the University of Texas at Austin has put episodes of The Mike Wallace Interview from 1957-8 on their website. There are video files of most of the episodes and transcripts of all of them.
As the website says,
Mike Wallace rose to prominence in 1956 with the New York City television interview program, Night-Beat, which soon developed into the nationally televised prime-time program, The Mike Wallace Interview. Well prepared with extensive research, Wallace asked probing questions of guests framed in tight close-ups. The result was a series of compelling and revealing interviews with some of the most interesting and important people of the day.