From MXA Mag:

GLOVER AND HANNAH

If a rider is in a close points battle, having a teammate move over can gain him valuable points that would make a difference at the end of the year. This was the case with the infamous "Let Broc Bye" strategy that Yamaha used in 1977 at the San Antonio 125 National. If Bob Hannah hadn’t slowed down and let Broc by, Team Suzuki’s Danny LaPorte would have won the 1977 125 National crown. What made Yamaha’s team tactics egregious, is that they wrote it down on the pit board (and Jody shot the famous photo).  

(Yamaha's Keith McCarty had two misspellings in three words.)