Labor's own caucus is growing increasingly frustrated with the slow pace of gambling advertising reform, pushing Communications Minister Michelle Wells to act on recommendations that have been gathering dust for months.The Murphy review into gambling ads was delivered to the government with a clear mandate for change, but meaningful reform has stalled amid what insiders describe as intense industry lobbying."We've got the evidence, we've got the recommendations, and we've got public support for change," said one Labor backbencher who asked not to be named. "What we don't have is action."Gambling advertising saturates Australian sport, with the average viewer exposed to hundreds of betting promotions during a typical weekend of football coverage. Studies have linked this exposure to problem gambling, particularly among young men.Public polling consistently shows strong support for restrictions on gambling ads, with majorities backing bans during live sport. But the industry has deep pockets and close ties to media companies that depend on advertising revenue.The gambling industry is estimated to spend over $300 million annually on advertising in Australia, making it one of the largest advertising categories on television.Wells has said the government is "considering" the Murphy review's recommendations but has given no timeline for action. With an election approaching, some in Labor worry the moment for reform may be slipping away."Every week we delay is another week of vulnerable people being bombarded with messages to gamble," said one addiction services advocate. "The government needs to decide whose side it's on."