Best definition
Wildcat strike
Wildcat strike is a strike called by workers without approval of the union leadership. It is particularly effective in key

industries and segments of the economy which depend on timeliness: transportation. Communication, education, agriculture. It could also be used to disrupt oppressive governments.

New York City teachers in a Queens high school called a wildcat strike today when it was revealed their administrator sexually harassed several female teachers and was never reprimanded or fired.
Wildcat strike: define #2
wildcat strike
When non-union employees go on strike due to unfair wages and or treatment.
I’m tired of this, let’s go on strike! Well we are not union! Then let’s go on a wildcat strike.