The GMB trade union has warned that scrapping of the Security Industry Authority (SIA) would pose a significant risk to public safety.
Yesterday, the Home Office confirmed that the future of the SIA, which licences door staff, is under review with an announcement due shortly.
The Home Office is considering whether the industry is now mature enough to police itself.
However, the GMB has now added to calls from bar and club trade body Noctis to make public safety a priority.
"It is important to remember that licensing in the security industry was brought in to keep out crooks, drug dealers and those convicted of criminal assaults to protect the public and create decent standards in the industry," said GMB general secretary Paul Kenny.
"If the security licensing authority is removed it will hit decent employers, it will expose the public to unnecessary risks and will undoubtedly end in tears and in the courts."
As of June 2010, the total number of approved security contractors was 672. There are almost 350,000 security workers with valid SIA licenses across the UK.