conspiracy
US /kənˈspɪr.ə.si/
UK /kənˈspɪr.ə.si/

1.
a secret plan by a group to do something unlawful or harmful
:
•
They uncovered a conspiracy to overthrow the government.
•
The police are investigating a conspiracy to commit fraud.
2.
the action of plotting or conspiring
:
•
The conspiracy of the rebels was quickly discovered.
•
They were accused of conspiracy to defraud.