Moscow ? Police thwarted a banned anti-Kremlin protest in central Moscow on Sunday, seizing dozens of demonstrators and shoving them into trucks.

Organizers said 130 people were detained around the capital, but police put the number at 90. The opposition movement headed by fierce Kremlin critic and former chess champion Garry Kasparov said the co-leader of the group was one of those seized.

The Other Russia movement organized the protest, in defiance of a ban, to draw attention to Russia’s economic troubles and to protest Kremlin plans to extend the presidential term from four years to six. Critics say the constitutional change as part of a retreat from democracy and is aimed at strengthening the grip of Prime Minister Vladimir Putin and his allies.