The phrase "actively fight for" is correct and usable in written English.
You can use it when expressing a strong commitment to advocating for a cause, belief, or principle.
Example: "Many organizations actively fight for environmental protection and sustainability."
Alternatives: "vigorously advocate for" or "strenuously support".
Mr. King is known to join picket lines himself — he did so in February when Toyota was planning to close a unionized California plant — and actively fight for numerous causes outside the auto industry.
In a comment piece for the American feminist blog Jezebel, Doug Barry wrote: "Divorce for men firms are about engendering in men a feeling that they're being treated unfairly by a prejudiced legal system, and then galvanizing them to actively fight for as much as they can hold onto.
Distributed to slaves via copies inserted into the pockets of clothes that he sold to sailors heading to the South, David Walker's caused outrage and fear in slave-owners as he called for slaves to actively fight for their freedom and to rise up and revolt against their owners.
Political figures shouldn't expect a pat on the head for pointing out a problem that the rest America is already well aware of -- We need leaders who actively fight for solutions.
This visit marks the beginning of the tennis champion's assignment as UNICEF Ambassador to actively fight for the rights of the child and to promote the importance of early childhood education.
For someone who has actively fought for East End heritage in the past this is beyond understanding and only suits her own short-sighted needs.
After Lenin's death, especially during the first years, Stalin actively fought for Leninism against the enemies of Leninist theory and against those who deviated.
He would have almost certainly won in Moscow, something which rankled: 'I can remember feeling irritated listening to people being introduced as Olympic champions from Moscow.' Away from the track, Moses actively fought for athletes' rights.
He was easy to talk to, made friends easily and actively fought for the acceptance of all people.
It does not concern itself with those who actively fought for freedom because that is not the story being told.
We are determined not to sit back and watch the erosion of things we have personally and actively fought for.
