See below for info from Finnlines
Five ports (Oulu, Kokkola, Rauma, Naantali and Turku) have received an industrial action notice from the Finnish Seafarers' Union FSU and the Transport Workers' Union AKT. According to the notice, the aforementioned unions organize a strike concerning tower crane operators and port supervisors, their members, starting on Monday, 29 January at 6 am. The announcement did not set a limit to the duration of the strike. The unions also state that if the employer in one way or another subcontracts work under the industrial action, they are ready to take supporting measures.
Finnlines informs its customers about the possible impacts of strike with traffic infos.