Question

populists believed that bankers, landowners, and political parties
were in constant conflict at the expense of important issues.
had taken over the knights of labor along with other labor unions.
supported collective action to achieve prosperity for all.
worked together to keep control of the us in the hands of the wealthy.

Explanation:

Populists in the US were concerned with the power - structure favoring the wealthy. They believed that bankers, landowners, and political parties colluded to maintain the wealthy's control over the country.

Answer:

D. worked together to keep control of the US in the hands of the wealthy