BEIJING – During her 30-hour train journey to Beijing, Wang Xiulan ducked into bathrooms whenever the conductors checked IDs. Later, as she lay low in the outskirts of the capital, unidentified men caught her in a nighttime raid and hauled her to a police station. She assumed a fake identity to get away, and is now in hiding again.

Wang's not a criminal. She's a petitioner.

She's among many people attempting to bring local complaints directly to the central government in an age-old Chinese tradition that has continued during the Communist Party era. But police never make that easy, and this week, as an all-important leadership transition begins, a dragnet is aimed at keeping anyone perceived as a threat or a troublemaker out of Beijing.