Conversation so far:
can you tell me one of the bigger political activities of robert dale owen?
Owen served in the Ordnance Commission to supply the Union army.
what year?
1863.
when did it come to an end?
on March 16, 1863, he was appointed to the Freedman's Inquiry Commission.
what else did he do in the political field?
In 1862 Owen wrote a series of open letters to U.S.
government officials.

Question: what were these letters about?
Self-contained rewrite: What were Robert Dale Owen's open letters about?