Trump threatens to invoke Insurrection Act. Has this legislation been used before?

Donald Trump has threatened to invoke the Insurrection Act to send US troops to Minnesota, a move experts say would be unprecedented since federal officers sent by Trump sparked the unrest. Legal scholars argue the situation does not meet the Act's criteria, as violence was initiated by federal agents, not local authorities. Historically, the Insurrection Act has been used to quell violence when local authorities are overwhelmed or to enforce civil rights, not to suppress protests against federal actions.