Is it a “policy” or a by-law. If it's only the former, the laundry monitors can take a running jump.
If it's a by-law, all they can do is issue a warning then have a meeting and issue a Notice To Comply.
Taking someone's property and putting it in a bin is an act of theft and vandalism.
Now, copy and paste this conversation, blow up the type size to fill an A4 page, print it and peg it to the washing line for everyone to see.
Headline? How about: 'Keep your grubby hands off my clean clothes'?