Not just "abortion materials", but all materials and information related to contraception. And that law defined abortion as just another form of contraception, rather than murder.
Can you make a case in favor of that law with the appropriate reference to the enumerated power that grants the federal government the authority to prevent it?
The 1873 law prevented the federal government from serving as the delivery service for obscene materials, which included abortion materials.
You wanted the federal government to perform that service for the abortionists.