What is the name of a movie in about 1970 where they gather street bums and people with no friends - they are then released and given a head start then rich people pay to hunt them down. Thanks Mal

Not from the 70's, but possibly this?
https://en.wikipedia.org/wiki/Hard_Target

.. ..Natasha discovers that her father distributed fliers for a seedy recruiter named Randal who has been secretly supplying Fouchon with homeless men with war experience and no family ties....

Surviving the Game (1994) is a close match, but not a 70's movie.

A homeless man is hired as a survival guide for a group of wealthy businessmen on a hunting trip in the mountains, unaware that they are killers who hunt humans for sport, and that he is their new prey.