Which tactics did businesses use to limit the power of unions? Choose four answers.

The tactics that businesses used to limit the power of unions among the options provided include:

1. Fired union leaders and organizers - This was a common tactic used by businesses to undermine union organization and leadership.

2. Locked out union workers from the job site - Lockouts were used by employers to prevent union members from working, effectively trying to weaken the union's bargaining power.

3. Hired workers to harass union members - This tactic involved using non-union employees or other individuals to create a hostile environment for union members.

4. Used scabs to replace striking workers - "Scabs" are workers who fill in for those on strike, which undermines the strike's effectiveness by allowing the business to continue operating.

The other options provided (promoting union leaders and organizers, and locking in union workers at the job site) are not tactics typically associated with limiting union power.