"An act of locking out a body of operatives; i.e. a refusal on the part of an employer, or employers acting in concert, to furnish work to their operatives except of conditions to be accepted by the latter collectively."
"... there has been some action on the part of the employer not justified by the employees' conduct which amounts to a refusal by the employer to continue to employ the employees on the terms and conditions of the contract of employment then existing between the employer and the employees bearing in mind that there cannot be a unilateral variation of such terms and conditions."