wildcat strike

Translations
стихийная забастовка
The workers staged a wildcat strike without union approval.
Рабочие устроили стихийную забастовку без одобрения профсоюза.
Definitions
A wildcat strike is a work stoppage initiated by employees without the authorization or agreement of their union leadership, often occurring spontaneously in response to grievances or disputes with management.
Words
strike

noun
забастовка
wildcat

noun
дикая кошка
wildcat

adjective
нелегальный