The Library of Congress, a 225-year-old Washington institution, has never had a moment like this. Here’s more about the library and the mystery of who’s in charge now.

It got going big-time in 1815, when former President Thomas Jefferson sold his 6,500-volume library to Congress to replace the one that was destroyed when the British burned the Capitol on Aug. 24 ...

For many years, the policy of the library has been to acquire one copy of every book published in the United States. Today, over 178 million items include not only books, but also maps, oral ...

“On Tuesday, January 21, the United States Capitol Police (USCP) ... 27, was stopped as he returned to his car after leaving the Library of Congress at around 2:15 p.m.