The FCC has reminded amateurs and users of other personal radio services that it is illegal to use radios in those services "to commit or facilitate criminal acts." A similar notices was issued on January 17 in the wake of the insurrection at the U.S. Capitol and in advance of the presidential inauguration on January 20.
There was no indication in the April 20 "reminder" as to what prompted its issuance, as no major national events were scheduled around that time.