Fmr Pioneer CEO Sheffield would often publicly signal to US producers -they should hold back pumping more oil & gas in order to keep prices high.
FTC alleges he also conducted a prv. campaign directly with OPEC officials: serious allegation of collusion to raise prices on Americans at the gas pump -to pad the profits of FF cos. Sheffield has campaigned to org. anticompetitive coord output reductions b/w US crude oil producers -incl. OPEC.