No, it is absolutely not.
Start by asking yourself which non-fringe socialist/communist party was not using the Leninist model of organisation, and which was not a member of the ComIntern and its successors? Which did not receive funding and ideological schooling in the Soviet Union?
You have an uphill struggle against history against you.
> non-fringe socialist/communist party was not using the Leninist model of organisation, and which was not a member of the ComIntern and its successors?
UK Labour party? Has everyone forgotten the Fabians?
The modern Green parties tend to be "left" but not necessarily inheriting from the Marxist tradition at all, generally post-dating WW2 (although this produces endless arguments about "watermelons"). Also modern left-wing parties of almost all colours are explicitly pro-human rights, which includes not only the right to privacy but the right to property!
Again, I'm not saying that there aren't some actual pro-Stalin "tankies" around, but it gets incredibly tedious having to defend everyone to the left of the Daily Mail from automatic charges of being a Stalinist. Congratulations on your dozen posts of derailing.
It is historically accurate to identify the extreme left with the ComIntern, i.e. the Soviet communist party, ruled during his lifetime by Stalin. Almost all communist parties were in the mould designed by Lenin, and refined by Stalin.
Even today, socialist / communist parties operate using the Leninist style of organisation, e.g. in the UK the SWP or RS21.
It is useful to know this, just as it's useful to know that Cambridge Analytica was owned by a company whose board is full of UK military/security-service types [1].
[1] http://bellacaledonia.org.uk/2018/03/20/scl-a-very-british-c...