Usage Note
Conspirer can be used transitively with contre (to conspire against someone) or intransitively when things conspire together: tout conspirait à le ruiner (everything conspired to ruin him). The related noun conspirateur/conspiratrice means conspirator, and une conspiration is a conspiracy or plot.
Examples
"Ils conspiraient contre le gouvernement."
Natural Translation
They were conspiring against the government.

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