Rabbi Danya Ruttenberg, at Life is Sacred, found research on non-violent resistance campaigns.
Chenoweth and Stephan even discovered something so important here that it gets a name: the 3.5 Percent Rule.
Everywhere they looked where a nonviolent resistance campaign engaged the “active and sustained participation” of at least 3.5% of that nation’s population: they won.
See also the CIA’s Simple Sabotage: A Modern Field Manual for Detecting and Rooting Out Everyday Behaviors That Undermine Your Workplace.