The phrase "a crowd criticizing" is correct and usable in written English.
It can be used to describe a group of people expressing disapproval or negative opinions about something or someone.
Example: "As the politician spoke, a crowd criticizing his policies gathered outside the venue, voicing their dissent."
Alternatives: "an audience denouncing" or "a group rebuking".
Some of the French entrepreneurial crowd criticized the idea, saying that the success of Y Combinator is heavily dependent on its founder, Paul Graham, on the large US market and on the active local investors.
Gingrich wound up the crowd, by criticizing the Republican establishment and the "Republican consulting class" for being out of step with the current political dynamic, suggesting that "vast" changes were required.
Alana Goodman, an assistant online editor of Commentary, joined the crowd with a piece criticizing me earlier this week.
The cancellation and walk off finished off a difficult week for West, who was widely criticized after telling a crowd in San Jose that he didn't vote in the US election, but if he did it would have been for Donald Trump.
On the first day of Washington Redskins training camp two weeks ago, a heckler stood near the front of the crowd and criticized every bad pass, every bobbled ball, and pined out loud for the return of quarterback Jason Campbell.
There may be some wishful thinking going on among those who are relieved that a diplomatic resolution to the crisis may be possible, but they have a far better grasp of what is possible in foreign affairs than the Republican crowd who criticize Obama.
Though Ryan's speech was emphatically received by the crowd, Fischer criticized him for leaving out the one issue that matters most to the pro-family constituency: the sanctity of marriage.
On Monday, before a crowd at a manufacturing plant, in Ohio, Donald Trump criticized Democrats who did not applaud during his first State of the Union address.
Ek, already a crowd favorite in Austin, elicited cheers when he criticized the television industry for not offering more a la carte services.
On June 18, Sullivan gave what was intended as a farewell speech to the board, criticizing "corporate-style, top-down leadership" as a crowd of thousands gathered on the lawn to protest.
