Examples of kinds of union action:

• formal letter from the union: Often hearing that a union is involved may scare bosses into acting. Requires the support of workers and the threat of escalation in order to be effective. LOW risk, MODERATE involvement needed.
• petition: A good step in escalation. Requires many workers to be involved as it might out union members, but can be used to embolden workers whether successful or unsuccessful. LOW risk, HIGH involvement needed.
• organised boycott: Organising the community to boycott a workplace. Doesn't put workers in danger, but if specific workers are found to be involved they may get in trouble. MEDIUM risk, LOW involvement.
• demonstration (company office, particular workplace): HIGH risk, HIGH involvement.
• comms zap: Organising the community to have everyone phone a company at a specific time to lock down their phones/email etc.
• publicity campaign / brand damage (stick to facts to avoid libel suit): LOW risk, LOW involvement.
• formal collective grievance: Often the first step to getting your grievance recognised is to list out your problems, your demands, and give a deadline. MEDIUM risk, MEDIUM involvement.
• work-in or an occupation: If many workers are being threatened with firing, going to work without getting paid can show that the work is viable and can be managed by the workers without management. HIGH risk, HIGH involvement.
• sick-in: Everyone calling in sick at once. Effective but may risk non-union workers getting mad at you. HIGH risk, HIGH involvement.
• good work strike: Doing work without charging customers. Very effective at getting the community on your side. HIGH risk, HIGH involvement.
• slowdown: Everyone slows down at a certain time to prove that workers have control over their productivity. Plausibly deniable. LOW risk, MODERATE involvement.
• work to rule: Work only according to the job role. Often jobs will have a lot of extra work not in the contract, and working to rule can grind it to a halt. note that often workplaces have an "any other reasonable work" clause in the contract, but it can be easily argued that particularly different tasks are outwith the terms. LOW risk, HIGH involvement.
• sitdown strike: At a certain time, everyone sits down and stops working for a short amount of time. LOW Risk, HIGH involvement.
• selective strike: A certain group of workers strike, e.g. kitchen staff, cleaners, nurses. Often just one bargaining unit ceasing to work can stop everything. HIGH RISK, MEDIUM involvement.
• open mouth/whistleblowing: Risky to an individual, but can get the community on side if they learn about the conditions. Will NOT solve issues on its own, contrary to popular belief. HIGH risk LOW involvement.
• ignore the boss: When everyone just ignores the boss and pretends they're not there. Extremely intimidating if the boss isn't expecting it, and proves that the workers can do their job without the boss' input. MEDIUM risk HIGH involvement.
• monkey wrenching / tricks and devilry!: Sabotage. Damaging company property, messing up on purpose, creating filing backlogs. Risky, but can cause substantial issues... Or get your colleagues to hate you. HIGH risk LOW involvement.
• solidarity: Employing these actions to the benefit of another group of workers-- e.g. if nursing staff are striking and your job is to take out the bins, stop out of solidarity. HIGH RISK, HIGH involvement.