Bahrain has arrested scores of people ahead of today’s third anniversary of a pro-democracy uprising. Opposition activists began protesting the U.S.-backed Sunni regime on February 14, 2011, amidst political upheaval in Egypt and Tunisia. The protests have been crushed by martial law and a U.S.-backed invasion of Saudi Arabian forces. Bahrain is a key U.S. government ally in the Gulf, hosting the Navy’s 5th Fleet. Activists have defied a government crackdown to hold protests throughout the week, and more rallies are expected today.