If you want to change the system or punish your wrong doers peacefully (you should strive for peaceful resolution), distribute anonymous pamphlets. Don't mention names and places and you are all done!
Soon, all of your city will know what happened! They may even suspect or know who did the wrong doing!
They may even isolate them, as they pose a danger to the cohesion of the group.
Perfectly legal!
What usually happens during a revolution?
revolutions entail not only mass mobilization and regime change, but also more or less rapid and fundamental social, economic and/or cultural change, during or soon after the struggle for state power.
If you are gay or bisexual or of other non-traditional gender, find a partner on IRC. Just download mIRC and select a nickname that denotes your gender.
If 25% of the population pushes for change, then 100% of the population will push for change. It's likely some sort of revolt will occur.
Why not keep it peaceful and save the troubles?
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Your unlike and unknown ally has a solution here, too!
Use Facebook!