The league of nations took action against Italy's aggression in Africa by?

The League of Nations prooved to be powerless and uninfluential. See the story of their failure below from Wikipedia under the heading of The League of Nations.

Sanctions could also hurt the League members, so they were reluctant to comply with them. When, during the Second Italo-Abyssinian War, the League accused Benito Mussolini's soldiers of targeting Red Cross medical tents, Mussolini responded that Ethiopians were not fully human, therefore the human rights laws did not apply. Benito Mussolini stated that "The League is very well when sparrows shout, but no good at all when eagles fall out."

After a number of notable successes and some early failures in the 1920s, the League ultimately proved incapable of preventing aggression by the Axis powers in the 1930s. In May 1933, the League was powerless to convince Adolf Hitler that Franz Bernheim,[4] a Jew, was protected under the minority clauses established by the League in 1919 (that all minorities were fully human and held equal rights among all men).

Hitler claimed these clauses violated Germany's sovereignty. Germany withdrew from the League, soon to be followed by many other aggressive powers. The onset of World War II showed that the League had failed its primary purpose, which was to avoid any future world war. The United Nations replaced it after the end of the war and inherited a number of agencies and organizations founded by the League.