JMC statement (pdf) on AMS Notices responses to mathematical boycott of collaboration with police.
JMC statement (pdf) on the US Capitol attack and its aftermath.
Math Boycotts Police
Abolition University.
Cut ties with Tel Aviv University and Greenberg Institute until detained Palestinian bodies are freed to their families and loved ones for burial.
Free Imad Barghouthi. A petition.
Freedom for Tuna Altinel. A petition.
The Zapatistas and ConCIENCIAS for Humanity.
Background on some of the above: Scientific American article on the cases of Altinel, Barghouthi, and jailed Russian mathematician and activist Azat Miftakhov. Update: as of 3 November 2020, Barghouthi is set to be released.