General Secretary Brian Roy said he was leaving to pursue a new challenge after five years in the post.
"Having been at the very centre of Scottish Labour during the most turbulent political times, I have worked hard to unite the party, drive our campaigns forward, develop and diversify our candidates and modernise our campaign machine".
A source said: "At the end of the day, Richard Leonard was elected on the promise of real change in Scottish Labour, and he clearly has to change the party operationally as well as politically".
"He has led the party organisation and the party's staff as our general secretary through a very turbulent time".
Labour deputy leader Tom Watson has spoken out against a second Scottish independence referendum, after shadow chancellor John McDonnell said a future Labour government would not block another vote.
Fatigued Thiem flattened by Medvedev in Montreal
The Russian faces sixth-seeded compatriot Karen Khachanov or German third seed Alexander Zverev in the last four. Was it Sofia that I won? We played all the same tournaments since 12 or 14 and we know each other pretty well.
In a statement, Jeremy Corbyn - whose Scotland adviser Tommy Kane is expected to step into the vacant role, according to The National - said: "Brian Roy's experience and knowledge has been invaluable to Scottish Labour, and to me personally, and I thank him for his dedication to our party and our movement".
SNP deputy leader Keith Brown said: "People across the United Kingdom overwhelmingly believe that independence should be a matter for the Scottish Parliament and the Scottish people - not Westminster". Scottish Tory leader Ruth Davidson (inset) pointed out that a "once in a generation" referendum had been held in 2014, and the separatists lost.
Scottish Conservative MSP Murdo Fraser said: "Barely a week goes by when a good person doesn't jump from the Labour ship, and it just inflicts deeper wounds from which they won't recover".
The UK is experiencing major power failures, with trains, airports and traffic lights having all been affected, the BBC reports. Delays and cancellations continued Saturday at London's King's Cross, one of the country's busiest train stations.
Again, it never came to fruition, this time because Apple could not negotiate the terms it wanted for the card. Despite this, however, it looks like it won't be as hard to get approved for the Apple Card as you may think.
Google is slowly beginning to open up about its next-generation operating system which will take Huawei HarmonyOS head on. Huawei has unveiled its own operating system, called Harmony OS , that has been in development for several years.
A man sent a tweet to police asking: "Hello, we've just been evacuated from Worthing Pier due to suspected chemical incident". An investigation into the incident was ongoing, police said, and a number of lines of enquiry were being followed up.
Prabhas also told in the interview that in the Hindi version of Saaho , his voice is not dubbed and Prabhas himself has spoken. The big-budget flick has been in the making for over two years and has been shot simultaneously in Hindi, Tamil and Telugu.
This is particularly important because the report raises serious concerns about how climate change will harm food security. The science is conclusive: in the US public land management must be part of our climate solution.
We look forward to welcoming the players back to the squad as soon as possible ." the statement by Arsenal on its website. In response, Kolasinac was seen confronting the thugs, and chasing them for a while, until they disappeared.
Lo Celso joins Tottenham on loan
This pair of singings come after the rumored move for Juventus star Paulo Dybala was called off. And Burnley secured the services of Danny Drinkwater on loan from Chelsea until January.
Katy Perry: 'I'm not going on tour anytime soon'
Her last album " Witness " was released in 2017, so it seems that we're due an album sometime soon, too. Then, she coos, "I just can't believe/We went from strangers to lovers to strangers in a lifetime".