As a result of the Palmer raids, hundreds of immigrants were

O deported

made citizens.

encouraged to be part of the Communist Party.

encouraged to join labor organizations.

A. Deported (I got this right)

Explanation:

The Palmer raids were conducted due to the First Red Scare. Back then people didn't know the difference between socialist, anarchist, and communist. Since many immigrants were socialist, anarchist, or communist there would be illegal raids where immigrants suspected of being one of these were taken and held without charge for long periods of time. Eventually they would be deported back to there country.