Here are the answers for each of your questions:
Question 1:
By what process can voters remove public officials from office?
Response: recall
Question 2:
What type of government system reduces the influence of political parties and ensures that the day-to-day operations of a city are run by an experienced professional?
Response: city manager
Question 3:
How did muckrakers help the labor movement?
Response: Muckrakers wrote stories about unsafe conditions in factories.
Question 4:
How did the Socialist Party of America (SPA) advocate for change from within the government?
Response: The SPA worked to elect its candidates to local, state, and government offices.
Let me know if you need any more information!