assistant (SLA), or legislative coordinator (LC): oversees the legislative staff, including all legislative assistants and correspondents. There is usually one in each office. Legislative correspondent (LC): Responsible for drafting letters in response to constituents' comments and questions and also generally responsible for a few legislative issues. According to the Dirksen Congressional Center, most House offices have one or two, while senators have three to five, depending on their state's population. Press secretary or communications director: Responsible for Member's relationship with media; is the liaison for the local and national press; issues press releases. Caseworkers or constituent services representatives'': Responsible for helping constituents deal with problems relating to federal agencies. For example, caseworkers help individuals secure veterans' benefits, aid with Social Security and Medicare, and resolve immigration issues. Caseworkers may also provide mediation services to constituents and obtain government information and publications. Committee staff Each congressional committee has a staff, of varying sizes. Appropriations for committee staff are made in annual legislative appropriations bills. Majority and minority members hire their own staff except on two select committees in each house—the Committee on Standards of Official Conduct and Permanent Select Committee on Intelligence in the House and the Select Committee on Ethics and Senate Select Committee on Intelligence in the Senate. These committees have a single staff. In 2000, House committees had an average of 68 staff and Senate committees an average of 46. Committee staff includes both staff directors, committee counsel, committee investigators, press secretaries, chief clerks and office managers, schedules, documents clerks, and assistant. Safety and security Like members of Congress, congressional staff have occasionally been the targets of violence or threats of violence. Between 1789 and 2011, there were five incidents affecting some congressional staff alongside members of Congress. The following recorded incidents of violence against congressional staff have taken place: In 1905, "Doc" Thompkins, private secretary to Representative John M. Pinckney of Texas, was wounded in a riot in which the congressman was slain. In 1935, Earle Christenberry, secretary to Senator Huey Pierce Long of Louisiana, opened a parcel bomb (which did not detonate). In 1978, Jackie Speier, then a staffer for Representative Leo Joseph Ryan of California, was seriously injured by a gunshot wound in an attack in Guyana, in which Ryan was assassinated. 1998 United States Capitol shooting incident: In 1998, two Capitol Police officers were killed by a gunman. 2011 Tucson shooting: In 2011, a