An illegal casino refers to a gambling establishment that operates without legal authorization or permits from the government. It is breaking the law by providing gambling and betting services unlawfully. Full definition
Here we have a young man named Seth (Ribisi, The Mod Squad) who feels he is letting down his Judge father (Rifkin, The Negotiator) when he drops out of college and later starts his own illegal casino in his apartment. (qwipster.net)
Seth Davis is a college dropout running an illegal casino from his rented apartment. (smallbusinessesdoitbetter.com)
From there, he ran an illegal casino as far back as 2004, according to Chinese police reports and court documents. (fortune.com)