Amos Kendall was an American journalist who wrote the most influential western papers such as Abolition Mail. In this piece he writes about how the fact that Anti-slavery publications are being rejected in the south. He also believed that the post master general has no right to "exclude from the mails any species of newspaper, magazines, or pamphlets." He also states that the newspapers produced in the south are pure propaganda and he encourages those papers to be stopped.
One interesting quote
When states become independent "they acquired a right to prohibit the circulation of papers within their territory; and their power over the subject of slavery and all its incidents, was in no degree diminished by the adoption of the federal constitution."