Short answers, pulled from the story.
The Russian undesirable organizations law is Federal Law of the 23rd of May 2015 N 129-FZ, which lets Russian prosecutors declare foreign and international organizations undesirable and shut them down. President Vladimir Putin signed it on the 23rd of May 2015.
President Vladimir Putin signed the Russian undesirable organizations law on the 23rd of May 2015. It followed the 2012 Russian foreign agent law and the Dima Yakovlev Law.
The first proposed list, sent to prosecutors on the 25th of May 2015, named the Carnegie Moscow Center, the human rights society Memorial, and the Moscow offices of Human Rights Watch and Amnesty International. In July 2015, the National Endowment for Democracy became the first organization officially blacklisted.
Organizations that fail to disband when ordered face fines or a prison term of up to six years. Individuals who cooperate with an undesirable organization face fines and can be barred from entering Russia, and Russians who maintain ties to one face the same range of penalties.
Russia's Ministry of Justice has declared 357 overseas and international organizations undesirable, including groups operating in Ukraine's occupied territories. Most of the affected organizations are based in Germany, Ukraine, the United Kingdom and the United States.
German Chancellor Angela Merkel's spokesperson called it an attempt to isolate and discredit civil society critics, while Britain's Minister for Europe, David Lidington, called it harassment of NGOs. The US State Department said it was "deeply troubled" by the law, and the Venice Commission's 2016 opinion found its key terms too vague and its discretion too broad.