The Japan Liberation Front ("JLF" for short) was prior to their destruction the largest Japanese resistance organization and is one of the most successful resistance forces in the Code Geass world. They attempted to undermine Britannian Rule over Area 11 (Japan) several times with limited success.
When the Holy Britannian Empire claimed Japan and renamed Area 11, several native Japenese rebellions arose to drive the empire out. The Liberation Front is perhaps one of the most xenophibic ones as they despise any one who is Britannian, men, women, children, civillian, soldier, nobility and royalty alike. They belive Japan belongs to the Japanese and the Japanese alone and are not above killing anyone who is Brittanian, even Brittanians with more noble beliefs then others(which there are). This is demonstarted when they hold a group of innocent Brittanians hostage inside a building and held them for ransom. If their demands were not meet, they would destroy the building and every Brittanian inside it. This act of terrorism thankfully was thwarted by the combined efforts of the Empire and Zero's Black Knights who defeated the terrorists and rescued the hostages.
Katase held the rank of General in the Japanese military and is also leader of the Japan Liberation Front. He was present during the Battle of Narita where he stayed in his HQ, overseeing the battle. Afterwards, Katase retreated with the remaining JLF members to Port Yokosuka on a freighter, where he planned on leaving Area 11. Zero plants a bomb under his ship and detonates it, killing Katase along with the JLF members who stayed with him.
Josui KusakabeJosui Kusakabe served in the Japan Liberation Front with the rank of Lieutenant Colonel. He was responsible for planning and executing the JLF Hotel Incident, where he gained many hostages including Third Princess Euphemia li Britannia and the Ashford Academy Student Council. Kusakabe talked with Zero and once it was reported that Euphemia is one of the hostages, he thought the masked terrorist was no use to him and lunged at him. Zero then ordered Kusakabe and his subordinates to die with the power of Geass, causing him along with his soldiers to commit suicide.
Kyoshiro Tohdoh served in the Japanese military as Lieutenant Colonel and then he later joined the JLF. He was leader of the Four Holy Swords, which was a unit within the JLF that served under Tohdoh. Kyoshiro was known for his miracle making and once Katase died, Tohdoh joined the Black Knights and gained the position as Head of Military Operations. Following the Black Knights' restructure, Kyoshiro became Head of Joint Staff.