The Church does not say that strikes are forbidden. If the wrongs to be righted are serious and urgent, and ordinary means fail, then workers can have recourse to extraordinary means. A general strike is forbidden as morally wrong, because the evils it causes are nearly always greater than those to be remedied. But the workers in any given industry may go on strike, yet granted only that certain conditions are verified. They must be animated, not by a spirit of vindictiveness, but by a genuine desire to secure the justice due to them. They must not strike for trifling reasons, but for the remedying of a grave injustice. The evil to be remedied must be at least as great as the evil to the community and to the workers themselves which the strike will entail. All other just means, such as arbitration, must have been tried without success, so that the strike is the last resort. The strikers must rely on moral compulsion, and not resort to physical violence. Their demands must be such as not to destroy the business itself with resulting injury to themselves and their employers. And finally, the strike must have a probable hope of success, so that all the miseries and inconveniences are not caused for nothing.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty