Despite foul autumn weather, Hungary's anniversary of the 1956 uprising against Soviet occupation brought over 100,000 antigovernment protesters to the streets on Sunday.

The main event, a grass-roots initiative with the slogan "I don't like the system," featured a rally where organizers said attendance reached 100,000. The protesters expressed general dissatisfaction with the politics of the current government as well as the political elite, and pledged to produce from their ranks a new generation of non-partisan politicians...