Ousting means forcing someone out of a position of power or authority.
Ousting can be seen as a strong or even aggressive action.
Examples:
The board voted for the ousting of the CEO.
The ousting of the dictator was celebrated by the people.
The ousting caused a big change in the company.
The ousting of the principal was a surprise to everyone.
The ousting of the queen was the biggest news in the country.
The ousting of the mayor was like a big party.