1) Increased federal enforcement . Before Hoover's death, the FBI did not aggressively investigate the Mafia.
( ( 1 -RRB- ) ( ( Increased ( ( ( federal ( enforcement . ) ) ( Before ( ( Hoover 's ) death ) ) ) ( , ( ( the FBI ) ( ( ( did not ) aggressively ) ( investigate ( the Mafia ) ) ) ) ) ) ) . ) )
(ROOT (S (LST (LS 1) (-RRB- -RRB-)) (VP (VB Increased) (SBAR (S (FRAG (NP (JJ federal) (NN enforcement) (. .)) (PP (IN Before) (NP (NP (NNP Hoover) (POS 's)) (NN death)))) (, ,) (NP (DT the) (NNP FBI)) (VP (VBD did) (RB not) (ADVP (RB aggressively)) (VP (VB investigate) (NP (DT the) (NNP Mafia))))))) (. .)))
The FBI started aggressively investigating the Mafia after Hoover was born. 
( ( The FBI ) ( ( ( started ( aggressively ( investigating ( the Mafia ) ) ) ) ( after ( Hoover ( was born ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP FBI)) (VP (VBD started) (S (ADVP (RB aggressively)) (VP (VBG investigating) (NP (DT the) (NNP Mafia)))) (SBAR (IN after) (S (NP (NNP Hoover)) (VP (VBD was) (VP (VBN born)))))) (. .)))