Greetings ...
OK Folks, here's the rest of the story ---
Around 1981, there was a "little disagreement" between the PGA Tour and the PGA of America over marketing issues involving the initials PGA. So in August of 81, then Commission Deane Beman announced that the Tour would from that point on be known as the TPA Tour, the letters standing for "Tournament Players Association".
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Front cover of the 1982 Tour Media Guide
The Tour functioned under the "TPA" heading until March 21, 1982, when the marketing issue was resolved. From then on the tour has been known as the PGA Tour.
Originally, when the tournament professionals broke away from the PGA of America back in 1968, the tour functioned for its first seven years as the "Tournament Players Division", then was re-named "PGA Tour".
In the late 1990s, former tour member Danny Edwards tried to get a players' union started, under the title of "The Players' Association". The attempt fizzled!
There is now a group of amateurs in Southern Florida known as the --
"Tournament Players Association of Southwest Florida"
Now you know the rest of the story.