On March 25, 2006, over 500,000 people protested in Los Angeles in reaction to anti-immigration legislation passed by the US House of Representatives. On December 17, 2005, the House passed HR 4437 [PDF], which would have imposed stricter penalties on undocumented immigrants living and working in the US. The protests were organized in direct response to Senate Majority Leader Bill Frist's suggestion that the Senate would begin debating the bill later in March 2006. Protests were also held in Charlotte, Dallas, Denver and Sacramento. Provisions in the bill which would have made certain charitable aid actions for undocumented immigrants a felony were rejected by the Senate on March 27, 2006. Further protests against the bill were held on April 10, 2006.