Last week, the FCC issued a Notice of Apparent Liability proposing a penalty of $718,000 against M.C. Dean, Inc., an electrical contracting company, for “interfering with and disabling the operation of consumers’ Wi-Fi devices at the Baltimore Convention Center.”  The NAL alleges the company blocked the personal mobile hot spots of visitors and exhibitors at the Convention Center during 10 events covering at least 26 days.  In a similar proceeding, the FCC issued a Notice of Apparent Liability proposing a fine of $25,000 against Hilton Worldwide Holdings, Inc. for failing to cooperate with the FCC’s investigation into whether Hilton illegally blocked Wi-Fi hotspots of guests at its hotel in Anaheim, California.