The RMT union is planning a protest against what it alleges is low pay at Channel Islands operator Condor Ferries.
The demonstration on 16 March at Portsmouth International Port will call for an end to "poverty wages".
RMT claimed Ukrainian Seafarers working on a three-month contract have been paid £2.46 ($3.42) per hour for a 12-hour working day. This is according to a 2014 contract, however.
The UK minimum wage is £7.50 for those aged 25 and over.
Macquarie-owned Condor operates under a contract with the governments of Jersey and Guernsey.
RMT wants a living wage of £9.75 per hour to be paid and collective bargaining to be recognised.
"Absurd statements"
Paul Luxon, Condor Ferries CEO, told The News: "Condor totally refutes the RMT’s absurd statements made in relation to our treatment of staff.
‘We fully comply with, and indeed exceed, domestic and international employment regulations covering the pay, terms and conditions and protection of all and which includes full compliance with the MLC 2006.
"95% of employees are recruited from the UK, Guernsey, Jersey and France and the remainder are non-EU nationals.
"Everyone is a proud and integral part of the Condor family and duty of care is one of the four pillars that underpin our business."
Condor is expected to be sold in the next 18 to 24 months, according to Guernsey's economic development president Charles Parkinson.
He said that if no buyer is found, the islands will "have to take an interest in it, because clearly we need to ensure that there is a ferry company operating to Guernsey."
The islands could also set up their own ferry company, but would prefer another long-term investor for Condor.
Condor said Macquarie's MEIF2 fund is closed-end and is nearing the end of its natural life.
