Why was the director of the factory arrested and sent to the gulag?

Gulag is actually a Russian acronym for Chief Administration of Corrective Labour Camps which was first developed by Vladimir Lenin. The gulags were a vast network of detention centres and forced labour prisons located within the former Soviet Union. members who failed to show up to protect Kirov, sent to the Gulag. Stalin calls the assassination an anti-Communist conspiracy from within the Party and launches a series of show trials, arresting and executing senior party members.