Modern Slavery Bill: Plans to tighten anti-slavery laws
16 December 2013 Last updated at 22:53 GMT
Life sentences will be brought in as part of a package of measures being proposed by Home Secretary Theresa May to tackle human trafficking.
The draft Modern Slavery Bill aims to increase the maximum custodial sentence for offenders from 14 years to life.
Some campaigners say the bill does not go far enough to protect victims of slavery.
The BBC's Alison Holt has been investigating how modern-day slaves are used in the drugs trade into the UK.