"act in contradiction of" is a valid phrase and can be used in written English.
It is used when you want to describe an action that is in opposition to something else. For example: "The CEO of the company acted in contradiction of the workers' wishes and refused to give them a raise."
In issuing its first moratorium on mergers, the Surface Transportation Board acted in contradiction to the Secretary of Transportation, Rodney E. Slater, who at public hearings last week opposed a formal delay while encouraging a comprehensive review of the rail industry.
"We strongly condemn the inhuman act of wild American soldiers, as ever, and consider this act in contradiction with all human and ethical norms," the statement said.
Partisan warfare (always successful, as history testifies) acts in direct contradiction of this rule.
As part of a civilized world, we cannot accept a power who has acted in contradiction and has wanted to use force to impose the rule over the South China Sea.
"It is extraordinary that the chancellor has not ringfenced newbuild property from this change, as it will act in direct contradiction to the raft of government policy designed to expand the rate of housing construction.
My map of the march names many unsolvable contradictions of our world, and lifts up the experiences of real people choosing to act in the face of these contradictions.
In voting for the bill, Obama acted in direct contradiction to his earlier statements.
A more craven act of submission would be hard to imagine; and they did this in the glow of victory, in direct contradiction of their mandate.
On the basis of his review, Öst argued that ACT research was not increasing in its quality and that, in contradiction to the views of Division 12 of the American Psychological Association APAACT ACT is "not yet well-established for any disorder" (2014, p. 105).
