That is the message from police and other experts gathering for a special event highlighting the issue on Friday.
Victims are due to share their experiences at the All Wales Anti-Slavery Conference in Llandudno.
Gwent Police officers who rescued a man who worked unpaid for 13 years on a Newport farm are also taking part.
Det Supt Mark Pierce from North Wales Police, who is the lead officer for the force on tackling slavery and human trafficking said: "It's imperative we identify and prosecute those responsible and make our communities safer.
"Human trafficking is serious and organised crime with those involved likely to be involved in the other serious crimes like drug production, kidnapping and the criminal use of firearms."
Among the guests also expected to address the event is the new UK independent slavery commissioner, Kevin Hyland.
North Wales Police are also launching a 'Say No to Slavery' campaign on its website on Friday.

The 28-year-old's nine-year-old daughter was also threatened by a member of the gang, who had a knife.
The burglary happened at their home in the Turf Hill area at about 05:30 BST on Wednesday, Greater Manchester Police said.
The three balaclava-wearing men stole cash, jewellery and a mobile phone before fleeing.
The offender carrying the gun, said to be a small silver metal handgun, was described as Asian, slim and aged between 20 and 30.
The man with the knife was black, between 30 and 40, of a medium build and with bloodshot eyes.
It is believed they were met by three other men outside the property.
Police are now appealing for anyone with information to contact them.
Det Con Rich Shelton said: "This gang targeted a mum and her young daughter, even stooping as low as to hold a gun to the head of a woman who was clearly heavily pregnant and absolutely terrified.
"Thankfully they were not physically injured and the unborn baby not harmed but the emotional trauma they have suffered is immeasurable."

The victim was threatened with a knife and handed over a sum of money during the incident in Windsor Avenue.
Police said they were told that a man had entered the property through a back window at about 10:00 BST on Monday.
The occupant managed to release himself before raising the alarm. He was not injured.
Police have appealed for information about the incident.
It is imperative that those involved in modern day slavery in Wales are caught and brought to justice.
[NEXT_CONCEPT]
A heavily pregnant woman had a gun pressed to her head when masked burglars broke into her Rochdale home.
[NEXT_CONCEPT]
A man was tied up and left in a bedroom of a house in Newtownards, County Down, following an aggravated burglary.