The phrase "acting in support" is correct and usable in written English.
It can be used when describing someone or something that is providing assistance or backing to a cause, action, or individual.
Example: "The volunteers are acting in support of the local community by organizing food drives."
Alternatives: "providing assistance" or "offering support".
He accused the company of acting in "support of the Assad regime's violence".
The attacks are believed to have been carried out largely by French Arabs acting in support of the Palestinians.
Syria's allies have been determined to portray themselves as acting in support of the country's army in battles around the country.
For more than a week, the rebel-held city of Aleppo, once Syria's largest, has been pounded by Russia's air force, acting in support of Iranian-backed militias and Syrian government troops.
The female reformers were acting in support of their husband and brothers, the demand for rights for women lay some years off, but the example they set of political activity by women was a template for later movements.
In explaining his veto, Mr. Kempthorne, whose first term ends this year, did not say he necessarily opposed term limits, only that he was acting in support of public sentiments.
Parks would go on to appear in more and more films, while still acting in supporting roles on TV.
The outer wall likewise had towers, situated approximately midway between the inner wall's towers, and acting in supporting role to them.
Concerning the support of human life in closed habitat, we can, conventionally, divide microorganisms, acting in life support system (LSS) into three groups: useful, neutral and harmful.
For while Mr. Malkovich's production features some full-blooded and witty acting in the supporting roles, the leads fail to imbue their characters with the cruel magnetism that is so crucial to animating the play's tortuous plot.
But Don Zimmer thought he was acting in a supportive way -- supporting his disgust for headhunting pitchers.
