People who have ordered from internet-based 24-hour booze delivery services are being asked to front up for interviews with NSW Police amid a government-ordered crackdown on the sly grog sales.

The operators of the services face maximum penalties including $11,000 fines and/or a year in prison if they are found to have breached liquor licensing laws.

The Beer Baron ... Jed Clarke.

NSW Hospitality Minister George Souris earlier this month demanded that the NSW Office of Liquor, Gaming and Racing (OLGR) take immediate action to investigate and close a loophole that allowed services like The Beer Baron and The Blind Pig to operate on an unlicensed basis as long as they treat sales as "gifts" accompanied by food or flowers.

The services use Facebook, websites and word of mouth to market their wares. However, it is illegal to sell takeaway alcohol after midnight, including deliveries.