sentences:  The union undertook a pressure campaign against the employers.The Employers' Association of Chicago initiated an anti-union campaign aimed at BSEIU, and not only resisted the union's organizing efforts but began an active public relations, legal, and media campaign to break the union.As the organizing drive continued throughout 1920 and 1921, both sides undertook a program of bombings, beatings, intimidation, extortion, and bribery.