Collocations for intervene - verb

actively, directly
personally
The President intervened personally in the crisis.

decisively
Government often intervenes decisively in major professional issues in medicine.

effectively, successfully
forcefully, militarily
Intervening militarily will not bring peace.

tactfully

be forced to, have to
Eventually, the army was forced to intervene.

be powerless to (esp. BrE)
Local people feel strongly about the proposed development but are virtually powerless to intervene.

be able to, have the ability to, have the power to, have the right to
Our government has no right to intervene.

be prepared to, be ready to
Nurses should be ready to intervene on behalf of their patients.

be reluctant to
refuse to
The UN refused to intervene.

against
They would not intervene against the rebels themselves.

between
She went over to intervene between the two men.

in
She was reluctant to intervene in what was essentially a private dispute.

on behalf of
The ambassador intervened personally on behalf of the children.

with
attempts to intervene with the authorities on the prisoners' behalf

Intervene is used with these nouns as the subject:
fate, minister, president