The Welsh Rugby Union has sent letters to a number of companies offering unofficial hospitality packages for the RBS 6 Nations home games at the Millennium Stadium, informing them that match tickets obtained in breach of the WRU's ticketing terms and conditions are null and void.
They have been informed the WRU is entitled to refuse entry to any supporter who arrives at the Millennium Stadium seeking to use a ticket bought as part of an unofficial hospitality package.
The WRU has made it clear that if the companies do not cease offering match tickets as part of unofficial hospitality packages, they could face legal action.
The letters sent out are part of a major operation being launched by the WRU to stamp out all unofficial hospitality around the Six Nations.
Supporters are advised to urgently check the providers of their hospitality as official packages can only be supplied by the WRU or its sole official off-site hospitality operator, Events International.
Any fans who have purchased unofficial hospitality packages for the RBS 6 Nations matches at the Millennium Stadium are being urged to contact the WRU as they face being refused entry to the games against England or Ireland.
The WRU's move to police the sales and distribution of its match tickets is to ensure money is kept within and reinvested in the national sport of Wales and for the first time ensures that WRU member clubs can distribute to an official and regulated off-site hospitality provider.
A number of WRU clubs have already participated in the WRU's scheme and sold tickets to Events International which is totally sanctioned by the union.
The WRU's approach will clear up any confusion for supporters who want to know that the hospitality package they buy is genuine and will ensure they get into the Millennium Stadium on matchday.
Head of Group Sales and Marketing, Craig Maxwell, said: "Enforcement teams will be in operation throughout the city and at turnstiles on matchday checking the tickets and passes to ensure they have come from official sources and will turn away ticket holders who have purchased through unofficial hospitality operators.
"By appointing an official supplier of off-site hospitality the WRU can control the trade and regulate the standards being offered to supporters.
"The RBS 6 Nations tournament is arguably the best rugby tournament in the world. It provides memorable experiences on matchday in and around Cardiff and the WRU is passionate about protecting the interests of the genuine fan."
All the member clubs of the WRU have been reminded of the ticket distribution conditions under which they receive their ticket allocation and have been requested to advise the WRU if they believe that they have distributed their tickets inadvertently or otherwise to unofficial operators. The WRU is now able to recognise tickets that have been the subject of unofficial hospitality.
Whenever Bedlinog tackle Penallta a massive fixure is guaranteed but this Sunday there will be even more emphasis placed on the two rivals when they contest the SSE Swalec Plate final at Principality Stadium.
Ahead of their SSE SWALEC Bowl Final clash with Taffs Well at Principality Stadium on Sunday, Burry Port share their #FABXV nomination with WRUTV in the search for Welsh rugby's greatest volunteers. Everyone can get involved by sending nominations via twitter to @WRU_Community using the hashtag #FABXV
Cardiff Blues prop Gethin Jenkins and Ospreys centre Ben John look ahead to the first game at Principality Stadium in Saturday's double header which is promising to be a special occasion for all Welsh fans.
Carmarthen Quins Director of Rugby Ian Jones and committee member Jeff Thomas along with Llandovery chairman Handel Davies look ahead to Sunday's SSE SWALEC Cup showdown where both teams are out to prove 'West is best'
SWALEC ambassador Shane WIlliams is looking forward to Sunday's Finals Day where the Cup, Bowl and Plate offers a great opportunity for players and teams to experience the magic of playing at Principality Stadium
Carmarthen Quins coach Richard Kelly believes it is an exciting time to be part of the Scarlets region as his side take on local rivals Llandovery in the SSE Swalec Cup final on Sunday, as WRU TV's Graeme Gillespie discovers
Scarlets long serving prop Phil John talks to WRU TV's Graeme Gillespie about Judgement Day IV and SSE Swalec Cup finals day. The last time Llandovery were in the cup final in 2007, the Drovers claimed the spoils with Phil playing a major role in the engine room.
Meet Aberdare coach Luke Thomas whose #FABXV nomination goes to super volunteer Daz with a whopping 10 things he does for the club each week, all except the ironing! You can also join in the search for Welsh rugby's greatest volunteers, by sending your nomination via twitter to @WRU_Community using the hashtag #FABXV
SSE Swalec Cup kings Pontypridd travelled to Swansea, fully expecting a return to their second home but Llandovery had other ideas as they also sought victory in the semi-final to earn the right to play the final at Principality Stadium