scheme against (someone or something)
To form or contrive a secret or devious plan or conspiracy in order to oppose, overthrow, or undermine someone or something; to plot against someone or something. A group of lower-level executives have been scheming against the CEO in a bid to wrest control of the company away from him. It turns out that they had been scheming against the alliance since the day it was formed.
scheme against someone or something
to plot or conspire against someone or something. A group of generals was plotting against the government. They schemed against the king until he caught them and put an end to it.