In 2002, partly in response to the events of 9/11, Russia implemented anti-extremist laws – laws which are written so vaguely that they can be broadly interpreted. In 2013, non-profit organizations that receive foreign donations and engage in "political activity" were required to register as foreign agents, which is a strongly pejorative Cold War term.
In 2014 Russia made the anti-extremist law more strict, and as a follow-up to the Foreign Agents Bill, on May 23, 2015, Putin passed the Undesirable Organizations Bill into law citing "National Security". The bill bans non-governmental organizations that it deems undesirable as a "threat to the constitutional order and defense capability, or the security of the Russian state."
Vlad considers himself the protector of all things Russian, and he appears intent on keeping anything that doesn’t support that cultural view either suppressed, out of the country or removed from it. The Dubs fit into this category, along with a lot of others.
The ironic thing is that the Dubs are a threat to internal security based on its destruction of families, blood issue and discouraging education to name a few. Maybe we should send Vlad an email like we did Angus Stewart.