Ms M (politically correct?) @ 1724 No, but they were strikebreaking a fully legal and democratic strike.
But if they are not a member of Unite they are neither blacklegs (a horribly emotive and very out dated term) nor can they be strikebreakers since their union or personal responsibility does not deem it a legal and democratic strike according to their own interpretation or responsibility since they had no vote in the matter, with which they are allowed legally and democratically to disagree
1984 was quite a thought provoking novel, have you read Animal Farm by the same author? 2 legs good forethought bad to misquote