Isaac Hayes III posted this video of Regal Cinemas employees apparently in the act of blackballing Nate Parker's slavery film Birth of a Nation.
Obviously someone higher up the food chain commanded the employees to say the movie was sold out. But I doubt they were targeting 'Nation' specifically.
This seems to be the movie version of payola, where theaters are paid to sell tickets to other movies to artificially boost a particular movie's ticket sales.
This is why you should look at your tickets before you step away from the ticket booth.
Thanks to FOB Omar "Slim" White for the tip.