give a free reign

give (a) loose reign to sth/sb (leave sth unchecked; have a loose control on sth such as feelings, actions, ideas) — пустить на самотёк, ослабить поводья; ослабить контроль

give (a) free rein (to allow someone or something complete freedom)

Example 1: The owners gave the chef free reign to create a new menu. (CIDI)

Example 2: She was afraid to give free rein to her feelings. (CIDI)

Example 3: If we are not careful, justice will break down, law and order will become meaningless and crime will be given a free reign.

Example 4: I'm not being given enough of a free reign.

See also
[carte blanche]
[give full swing]
[развязать руки]
[no elbow room]

[let it slide]

Opp.
[держать на коротком поводке]