Anti-slavery co-ordinator Stephen Chapman says slavery is "still a prevalent crime in Wales".
Two Czech women brought to the UK for prostitution had been working in an executive gated development just yards from the main Cardiff Bay police station.
Today the pair who admitted to trafficking the women into Wales were given jail sentences at Newport Crown Court.
The case comes amid fresh warnings that trafficking is a growing problem here in Wales.
Kim-Ann Williamson, chair of South Wales Anti-Human-Trafficking Group, says human trafficking is a "very real" problem.
Police have urged potential human trafficking victims to seek help after two people were jailed today for trafficking offences.
The Crown Prosecution Service said human trafficking is "modern-day-slavery" and "totally unacceptable in a civilised society".
The Crown Prosecution Service has released pictures of two people jailed today for trafficking two women into Wales for the purposes of prostitution.
At an earlier hearing, Ladislav Kurina and Angelica Bacan each pleaded guilty to two counts of intentionally arranging or facilitating entry into the UK of a person with a view to their sexual exploitation.
They also admitted two counts of arranging travel within the UK of a person with a view to their sexual exploitation.
Kurina also pleaded guilty to possession of a prohibited weapon and received a total sentence of two years and seven months.
Bacan was jailed for 15 months.
A man and woman have been jailed for bringing two Czech women into the UK to work in the sex industry.
Ladislav Kurina, 29, from the Czech Republic, and Angelica Bacan, 26, from Romania, admitted four counts of trafficking for prostitution.
Newport Crown Court heard the two Czech women, who were brought to the UK in September last year after responding to an advert for sex workers, were initially taken to various addresses in the south-east of England.
They were eventually taken to a flat in Cardiff, where their conditions worsened.
Eventually they were able to seek support from Safer Wales - a charity offering support to victims of abuse - who in turn contacted South Wales Police.
Ladislav Kurina admitted an additional count of possessing an illegal weapon and was sentenced to two years and seven months in total.
Bacan received 15 months.
Both will have the time already spent in jail considered as part of their sentences.