1 2 3 1 _ _ _ 2 _ _ _ 3 _ _ _ ACROSS 1) an agency in the department of justice that enforces laws and regulations for the admission of foreign-born persons to the united states 2) the former capital and 2nd largest city of brazil; chief brazilian port; famous as a tourist attraction 3) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium DOWN 1) a militant organization of irish nationalists who used terrorism and guerilla warfare in an effort to drive british forces from northern ireland and achieve a united independent ireland 2) a luminance u___ equal to 1 candle per square meter measured perpendicular to the rays from the source 3) an internationally recognized distress signal in radio code ** Scroll down for solution. ** Are you sure you want to peek? ins rio ats