Officers from the Management of Sex Offenders and Violent Offenders (MOSOVO) team carried out separate warrants and searches after allegations of adults communicating with children online.
Following the execution of a warrant in Harwich on Friday 31st January, a 32-year-old male was arrested on suspicion of breaching a sexual harm prevention order and failing to comply with the requirements of the sex offender's register.
He has since been released under investigation.
Officers also charged two other men in connection with separate incidents.
34-year-old Lee Smith, of Hastings Road in Southend, has been charged with failing to comply with the requirements of the sex offender's register, two counts of breaching a sexual harm prevention order, and two counts of attempting to engage in sexual communication with a child.
He is due to appear for a pre-trial preparation hearing at Basildon Crown Court on 26th February.
And Lee Bergstrom, who's 31 and from Nipsells Chase in Mayland, has been charged with engaging in sexual communication with a child and breaching a sexual harm prevention order.
He pleaded guilty at Chelmsford Magistrates' Court on Thursday 30th January and is due to be sentenced on 27th February.
Detective Chief Inspector Hayley King, from Essex Police's Public Protection Unit, said: "MOSOVO is one of a number of teams helping to protect people from harm.
"The work they do is really important but, due to its nature, often takes place away from the public eye.
"The officers are diligent, meticulous, and dedicated in what are often challenging circumstances.
"It’s just another way we’re protecting Essex."