A Washington nonprofit group sued Apple in federal court Sunday, demanding that it remove Telegram, a chat and social media app, from its app store for failing to crack down on violent, extremist conversation in the aftermath of the Jan. 6 attack on the U.S. Capitol.

The suit amounts to a pressure tactic to get Apple to act against Telegram as it already has against Parler, a social media site that swelled with calls for violence and insurrection ahead of the Capitol siege, according to researchers. Apple and Google both have booted Parler from their app stores because of its lax moderation policies, and Amazon Web Services withdrew support as well, disabling Parler last week on the same grounds. Telegram offers both closed, private chat rooms and public groups that anyone with the app can join.

Read more: Washington Post