Protests
The mass protests started in February 1986, with several meetings of Kosovo Serbs in Belgrade and in Kosovo, pleading for a resolution of the problematic situation on Kosovo. These were relatively small, with 100-5,000 participants, and were mostly reactions to individual inter-ethnic incidents. The largest such protest was held in Kosovo Polje in April 1987, gathering around 20,000 people.
However, the outburst of protests began in the latter half of 1988. In June, the protest of workers of the Zmaj factory gathered 5,000 protestors; in July, meetings were held in seven towns with tens of thousands protesters, and in August in ten towns with 80,000 people. By September they spread to 39 towns with over 400,000 people.
Read more about this topic: Anti-bureaucratic Revolution