Socialist hosts meeting that's organised and strictly regulated (10)

'strictly regulated' is the definition.
The definition and answer can be both to do with social activities as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?

'socialist hosts meeting that's organised' is the wordplay.
'socialist' becomes 'red' (red is a kind of socialist).
'hosts' means one lot of letters goes inside another.
'that's organised' indicates anagramming the letters.
'meeting' is an anagram of 'egiment'.
'red' placed around 'egiment' is 'REGIMENTED'.

'and' is the link.

Can you help me to learn more?