Answer:
Workers going on strike and picketing.
Step-by-step explanation:
Strike: When workers decide not to work, forcing their employer(s) to consider and address their demands.
Picketing: When workers protest their complaints to their employer(s) by holding up signs and parading around their employer(s) location.
These are tactics used by workers to try and get their employer(s) attention on certain matters.
Lockouts are another tactic but this is used by the employer(s), not by the workers. In this tactic, the employer(s) will restrict access to the worksite to all employees.