Here is the contact tree of the contacts, and i will be posting some information about what you unlock on them.
Criminals

Enforcers

Some Information what you unlock on them
Everything that is RED marked is what you earn!!
Praetorians / G-Kings
Progression 1
Tier 0 - Ty Durrant | Veronika Lee (Financial)
6: OCA-EW 626.1 "Mortician" (-15% Reload Time)
Tier 1 - Grissom | Shift (Financial)
3: JG-841 "The Jimmy" (+1 Clip)
6: DMR-SD 1 "Vulture" (-13% Equip Time)
Tier 2 - Miguel Estebano | Harmon Benjamin (Waterfront)
3: OBIR.2 "Billy The Kid" (+15% Clip Size, +3m Range)
6: JG-842 "The Billy" (-15% Reload Time, +2 Clip Size)
Tier 3 - Kaspar Danko | Grayson Fell (Financial)
Kaspar Danko
3: OCA-EW 626.3 "Undertaker" (-25% Reload Time, +8% Fire Rate, +5% Hip-Fire Accuracy)
6: JG-843 "The Gief" (+3 Clips, -20% Reload Time, +5% Firing Rate)
Grayson Fell
3: OBIR.3 "Jesse James" (+5 Clip Size, +5m Range, +5% Damage)
6: N-tec 5c "Amigo" (+3 Clips, +7 Clip Size, +5% Hip-Fire Accuracy)
Progression 2
Tier 0 - Eva Orlandez | Terry Quan (Waterfront)
6: STAR 556 I "Army Ant" (+3 Clip Size)
Tier 1 - Sabbat | Chiro (Waterfront)
3: SHAW I "Badger" (-5% Recoil)
6: Broadwing B101 "Gecko" ()
Tier 2 - Saul Linklater | Javez (Financial)
3: Obeya CR762.2 "Peggy" (-15% Reload Time, +5m Range)
6: SHAW II "Wolf" (-10% Recoil, -13% Equip Time)
Tier 3 - Hea Choi | Bonita Benjamin (Financial)
Hea Choi
3: OBIR.3 "Jesse James" (+5 Clip Size, +5m Range, +5% Damage)
6: N-tec 5c "Amigo" (+3 Clips, +7 Clip Size, +5% Hip-Fire Accuracy)
Bonita Benjamin
3: OCA-EW 626.3 "Undertaker" (-25% Reload Time, +8% Fire Rate, +5% Hip-Fire Accuracy)
6: JG-843 "The Gief" (+3 Clips, -20% Reload Time, +5% Firing Rate)
The Big Bossman
Tier 4 - Justin Teng | Arlon Benjamin (Financial)
4: OSMAW Rocket Launcher
5: NFAS-12c "Push Broom" (-25% Reload Time, +10% Damage, +5% Fire Rate)
6: Level 3 Upgrade of your Choice; Cisco (+30% Time Before Exploding, +15% Explosion Damage and Radius)
Prentiss Tigers / Blood Roses
Progression 1
Tier 0 - Violet Prentiss | Strega Bloodrose (Financial)
6: OBIR.1 "Wyatt Earp" (+2 Clip Size)
Tier 1 - Stu Phoenix | Byron Bloodrose (Waterfront)
3: N-HVR 762a "Hill Top" (-13% Equip Time)
6: NFAS-12a "Squeegee" (-15% Reload Time)
Tier 2 - Daryl Kent | Seung Bloodrose (Financial)
3: STAR 556 II "Mantis" (+5% Marksmanship Accuracy, +5 Clip Size)
6: N-HVR 762b "Rooftop" (-26% Equip Time, +3m Range)
Tier 3 - Chiza | Tyron Sennet (Waterfront)
3: Obeya 762.3 "Joan" (+7m Range, -20% Reload Time, +5% Damage)
6: N-HVR 762c "Grassy Knoll" (-39% Equip Time, +5m Range, -15% Reload Time)
Progression 2
Tier 0 - Chung-hee | Britney Bloodrose (Waterfront)
6: Obeya CR762.1 "Rose" (+3m Range)
Tier 1 - Mirri Kent | Suji (Financial)
3: N-tec 5a "Side Kick" (+1 Clip)
6: Montane II "Oni" (+15% Time Before Catching Fire)
Tier 2 - Akiko X | Lilith Bloodrose (Waterfront)
3: OCA-EW 626.2 "Hangman" (-20% Reload Time, +5% Fire Rate)
6: N-tec 5b "Comrade" (+2 Clips, +5 Clip Size)
Tier 3 - Byeong Lee | Jeung Bloodrose (Waterfront)
3: STAR 556 III "Spider" (+6 Clip Size, +10% Marksmanship Accuracy, +5% Damage)
6: SHAW III "Lion" (-10% Recoil, -26% Equip Time, +5% Hip-Fire Accuracy)
The Big Bossman
Tier 4 - Orlenz Moretti | Michael Simeone (Waterfront)
4: Grenade Launcher
5: DMR-SD 3 "Falcon" ()
6: Morai; Level 3 Upgrade of your Choice
I TAKE NO CREDITS FOR THIS! I FOUND IT ON GOOGLE!