What strategies do unions and employers use to pressure each other into settling a contract?

"In Quebec, Canada, after union members went on strike, Table 8.5 provided a summary of union and employer pressure strategies for forcing a contract settlement. Union strategies include strikes, in which employees refuse to work; boycotts, in which employees try to keep customers and others from doing business with the employer; picketing, in which employees march near the entrance of the firm to publicize their view of the dispute and discourage customers; and corporate campaigns, in which the union disrupts stockholder meetings or buys company stock to have more influence over management. Employer strategies include lockouts, in which the employer refuses to let employees enter the plant to work; strike replacements, in which the employer uses nonunion employees to do the jobs of striking union employees; mutual-aid pacts, in which the employer receives money from other companies in the industry to cover some income lost because of strikes; and shifting production, in which the employer moves production to a nonunion plant or out of the country."