After canceling a march for the opening game of the season ahead of facing Arsenal, the 1958 group are preparing to stage a protest before the February 1 game with Fulham.
"After lurching from one disaster to another, Ratcliffe comes across as an incompetent clown turning the club into a circus," said the 1958 group in a statement.
"Instead of best in class, we're a laughing stock.
"It has been an extraordinary and deeply troubling few days at Manchester United. On the pitch, we are watching mediocre performances from an average team drifting without identity, direction, or ambition. Off it, the chaos is even worse."
The statement arrives in the week that United sacked manager Ruben Amorim.
"Let us be clear: this is not a defence of Ruben or the football served up under him," continued the 1958 group statement. "Much of it was unacceptable.
"But his dismissal once again exposes the continued dysfunction at our club."