MC Dean and Hilton have joined Marriott in the FCC's list of companies that block personal hotspots. In fact, the commission has proposed a $718,000 fine against MC Dean, Baltimore Convention Center's sole WiFi provider. The investigation on MC Dean began last year when a company that sells equipment exhibitors can use to set up hotspots in convention centers filed a complaint. Apparently, the WiFi provider charges visitors as much as $1,095 per event for WiFi access, and it has since admitted that its system automatically blocks hotspots by default. Its blocking capability is so powerful, it even affects connections outside the convention center, even those inside passing vehicles.