MOSCOW — Russian Communists and left-wing activists from around the world marched through central Moscow on Tuesday to commemorate the centenary of the Russian Revolution, in a pale shadow of grand Soviet demonstrations on Red Square.

The mood at this year’s celebration was more subdued than at previous ceremonies, despite the milestone anniversary and the global feel as organizers invited representatives of left-wing movements from 88 countries to attend. The day also highlighted the stark contrasts between today’s Russia and the ideals embraced in the revolution 100 years ago.