Looking for an English word or expression for not having a real boss in charge

There is a Hungarian word fejetlenség, literally, having no head, in the state of having no head, meaning a situation where a state or an organisation is an unruly mess.

Is there an English expression for this?

http://www.thesaurus.com/browse/disorganization

gives many synonyms

but I did not find one that uses this way of expression

a figurative one

is there one?

UPDATE: unruly mess itself might be close, as

http://www.finedictionary.com/unruly.html

says unruly is "unwilling to submit authority", in my words: disobedience

but what I want to emphasize is that there is no authority, not that people rebel against it

You should consider rudderless to describe the organisation when no (real) boss is present.

rudderless (adjective)
(of an organization) without anyone in control and therefore unable to take decisions

You should check unaccountable from the perspective of the staff when no (real) boss is present.

unaccountable:

: not required to explain actions or decisions

: not required to be responsible for something

Consider

HEADLESS

From Webster

1. without a head

2. without a leader

or even simply

Leaderless

Although it does not show as an individual entry in the dictionary, its' the most common.

Compare leaderless with headless and rudderless, the later does not even register in Ngram.

"Acephalous" is a rare word, but it's legitimate English - basically a Greek calque off the word "headless."