tight security is in force ❍ 而对于党，对组织却是～，有话不谈。(郭小川《论朋友》)In their dealing with the Party and the organization,they hold their tongues and tight security is in force.
戒备森严
heavily guarded
戒备森严jiè bèi sēn yán
指警戒和防备非常严密。be heavily guarded, tight security is in force, be colsely guarded