A top aide to embattled New York Police Department Commissioner Edward Caban is associated with shadowy groups that do the bidding of the Chinese Communist Party, The Post has learned. Lin Gui’an, 49, the assistant director of the Police Commissioner Liaison Unit, was previously vice chairman of a nonprofit linked to a web of CCP-controlled community groups and school associations, known as United Front, for 12 years, according to records viewed by The Post. He has also been pictured attending events alongside prominent members of United Front groups or sponsored by them. The role of United Front is to spread...