Investigated a collection of suspicious accounts and found last 30 days transactions between them as follows:
Confirmed Multi Accounts

Group Number	Account Names	Suspicious Type
Suspicious #1	@robert31, @steem-ripon	Transactions (Confirmed)
Suspicious #2	@nomita, @sizuka, @mintu13, @applo, @david786, @coubra12, @tahsinhasan, @ashik785, @black35, @davitd	Transactions (Confirmed)
Suspicious #3	@perry1, @max1994, @rik432, @ratul8940, @rahul72, @taylor10, @villani, @wilson6	Transactions (Confirmed)
Suspicious #4	@smileplease, @saqqu, @letssmile	Transactions (Confirmed)
Suspicious #5	@ritue, @pariza, @suchi, @maicle, @quinnpeterson, @ziaurrahma, @steemitsabbir1, @utpolbiswas, @davitone, @steemitsabbir1	Transactions (Confirmed)
Suspicious #6	@depu, @trickbd, @steemoffice, @rasal, @opubd, @khaleck, @depubd, @bkash, @abulbd, @janvir, @depurakib, @badol	Transactions (Confirmed)
Suspicious #7	@amsakhan, @nomishiekh, @fatimakhan, @amnaali	Transactions (Confirmed)
Suspicious #8	@anikhassan007, @anik-hassan, @fazlehassan, @kinggo, @shuvrokhan, @rahuljoy, @sohelkhan007, @rockykhan, @alex-linda, @anik1998, @sportslover, @shanto62, @nodald-pump, @shikto, @fariha1752, @yanafariha	Transactions (Confirmed)
Suspicious #9	@mithuj, @asif4745, @blueorgy79, @rahulislam, @jose92, @aowal202, @angela002, @shawn4745, @loandela, @shagorshikder, @steem247, @reon06, @greenwhell79, @killerboy, @prapto0045	Transactions (Confirmed)
Suspicious #10	@faissalchahid, @seniorpower	Transactions (Confirmed)
Suspicious #11	@sthitaprajna, @crypto-wisdom, @shivohum2015, @pardeepkumar, @spiritualpower	Transactions (Confirmed)
Suspicious #12	@martha75, @dim753	Transactions (Confirmed)
Suspicious #13	@adedoyinwealth, @charleswealth	Transactions (Confirmed)
Suspicious #14	@mical, @nilima	Transactions (Confirmed)
Suspicious #15	@rogerenrique, @hernanjosegb, @dayannita, @paoladlva95, @marlongonzalezr7, @davidmaldonado, @steem-pays, @leonardobasti, @carmenma, @algueiralisbeth	Transactions (Confirmed)
Suspicious #16	@pornworld, @haseebkhan, @khankhan, @lovekhan, @ohhhhh, @hkniazi	Transactions (Confirmed)
Suspicious #17	@sumonsha, @purepinag	Transactions (Confirmed)
Suspicious #18	@raihan12123, @rohit12123	Transactions (Confirmed)

Suspicious doesn't mean these accounts are multi accounts of a same owner. But these accounts had transactions between them in last 30 days & commented on the same posts.
Suspicious Accounts (Under Investigation)

Group Number	Account Names	Suspicious Type
Suspicious #1	@humaidi, @putry01, @kesya, @fauzanhaikal	Transactions (Under Investigation)
Suspicious #2	@beforandafter, @askmee, @scoopian	Transactions (Under Investigation)
Suspicious #3	@durgaani, @kiranmaidurga, @steemithero	Comment Pattern (Under Investigation)
Suspicious #4	@darvancast, @enriqueig	Transactions (Under Investigation)
Suspicious #5	@moniristi, @shishiristi	Transactions (Under Investigation)
Suspicious #6	@abdurrahim007, @adamkun, @imranimu, @abitoo7	Transactions (Under Investigation)

Previously listed as Suspicious, but Trustworthy different owners accounts are listed below:
Trustworthy Accounts

Group Number	Account Names	Suspicious Type
Trust #1	@serkagan, @magnata	100% (Confirmed)
Trust #2	@sezenke, @cemke	100% (Confirmed)

For Your Information (FYI) : @steemcleaners, @spaminator, @mack-bot

@magoo-1 is not belongs to Mr. Magoo

Regards Mr. Magoo Delegations, Upvotes & Donations Accept to Power Up @magoo