cscommands.commarkup_group_ent_text
markup_group_ent_text <markup_group name> -> toggle ent_text for all members of the named m...
For this command to work you must first run
sv_cheats true in the console. It only works on a local map or a private server — not in matchmaking. sv_cheats is a built-in Valve command and is completely safe from VAC.