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.
