Senate Sergeant-at-Arms Terrance Gainer sent an e-mail to Senate staff Tuesday warning Members that a national organization is urging people to stage health care reform protests in Congressional offices on Thursday.

Mobilization for Health Care for All, a campaign to end private health insurance, is planning sit-ins at Member offices across the country on Thursday, which is Human Rights Day. An e-mail sent by Gainer’s office assured staffers that the Capitol Police “are aware of this event and are prepared to address issues as they may arise.—

“It is important to note that this is a non-violent group that sometimes encourages civil disobedience as a means to sway public policy,— the e-mail states. “To date, the group claims thousands of supporters in over 30 cities nationwide, but it is unknown how many supporters will visit the various Member state and DC offices.—

The campaign’s Web site, mobilizeforhealthcare.org, urges people to go to their Senators’ offices and demand that they support universal health care. If they don’t, some protesters “will choose to sit down, and refuse to leave their office until they do,— according to the Web site.