The 3, 2 Hungarian men and 1 British woman, were arrested on suspicion of trafficking at locations in Croydon.
The investigation, codenamed Operation Amber, is being led by the UK Border Agency’s South East criminal and financial investigation team, but operations also involved officers from the Sussex and Metropolitan police forces as well as the UK Human Trafficking Centre (UKHTC).
Assistant director Rob Allen, from the UK Border Agency’s criminal and financial investigation team, said:
‘We believe we have disrupted a significant organised crime group suspected of being involved in the trafficking of young women into the UK from Hungary.
‘We have made three arrests, and our investigation will continue with evidence we have seized today.
‘Human trafficking is an abhorrent crime where people are traded as commodities. We are determined to do our part to stop those behind it.’