Saban refused to grant a release and blocked Maurice Smith from transferring to UGA until SEC intervened.
"Smith wanted to follow new Georgia head coach Kirby Smart, his former defensive coordinator at Alabama. When Smith originally met with Alabama coach Nick Saban in June regarding the matter, Saban told Smith that he would not release him to an SEC school, according to a letter Smith wrote to the Alabama appeals committee and obtained by the Atlanta Journal-Constitution."
SEC allows Smith to transfer from Bama to UGA
A K State player asked for a release to one of 35 schools but Bill Snyder refused a release to all 35 programs:
"Kansas State wide receiver Corey Sutton is looking to transfer away from the program, but according to him, his scholarship release is not being granted.'
Snyder blocked a player’s transfer list of 35 schools
Miami blocked Evan Shirreffs transfer request:
"Shirreffs said Miami originally blocked him from transferring to an ACC school or a nonconference opponent in 2018 and ‘19. But he won an appeal with the NCAA, which allowed him to transfer to North Carolina, Duke or Virginia - all of which have MBA programs. "
https://www.google.com/amp/s/amp.charlotteobserver.com/sports/college/article220090385.html