GCSB full for is Government Communications Security Bureau.   

What is  Government Communications Security Bureau?

Government Communications Security Bureau (GCSB) is the public-service department of New Zealand charged with promoting New Zealand's national security by collecting and analysing information of an intelligence nature. The GCSB is considered to be New Zealand’s most powerful intelligence agency, and has been alleged to have conducted more espionage and data collection than the country’s primary intelligence agency, the less funded NZSIS. 

GCSB full for is Government Communications Security Bureau.   

What is  Government Communications Security Bureau?

Government Communications Security Bureau (GCSB) is the public-service department of New Zealand charged with promoting New Zealand's national security by collecting and analysing information of an intelligence nature. The GCSB is considered to be New Zealand’s most powerful intelligence agency, and has been alleged to have conducted more espionage and data collection than the country’s primary intelligence agency, the less funded NZSIS.