Hong Kong Federation of Students
Three members of the Hong Kong Federation of Students led by Alex Chow, who had booked air tickets to Beijing to put their case in front of the national leadership during the 2014 Hong Kong protests, found out through airline agents that Chinese authorities had revoked their Home Return Permit, effectively banning them from travelling to Mainland. No official notification of the revocation or explanation of the grounds for their cancellation were ever made to the holders.