This document discusses content blocking and filtering at the national level. It notes that governments are interested in controlling the internet to curb issues like child protection, religion, culture, politics, and fake news. Content blocking can occur at the national, carrier/ISP, local network, and end user levels. The document outlines technical challenges with content blocking like breaking the internet or blocking access wholesale. It also discusses sociopolitical issues like threats to privacy and freedom of speech from nationwide filtering and shutdowns. The conclusion questions if technical filtering can truly solve socio-political problems or if alternative solutions are needed.