Please answer the following question: I know that the answer to the question "What was the action that Seattle police were reacting to?" is in "Seattle in this period attracted widespread attention as home to these many companies, but also by hosting the 1990 Goodwill Games and the APEC leaders conference in 1993, as well as through the worldwide popularity of grunge, a sound that had developed in Seattle's independent music scene. Another bid for worldwide attentionhosting the World Trade Organization Ministerial Conference of 1999garnered visibility, but not in the way its sponsors desired, as related protest activity and police reactions to those protests overshadowed the conference itself. The city was further shaken by the Mardi Gras Riots in 2001, and then literally shaken the following day by the Nisqually earthquake.". Can you tell me what it is?
Answer:
protest activity