501 c )( 6 of the internal revenue code July 8, 2019 16 32 64 128 Section 501 c )( 6 of the internal revenue code Section 501 c )( 6 of the internal revenue code of 1986 501(c)(4) of the internal revenue code 501(c)(3) of the internal revenue code Section 501(c)(3) of the internal revenue code (irc) ยง 501(c) of the united states internal revenue code