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834Rh review was available. It rejected the Secretary's argument that the statute precluded judicial review, and in a footnote it stated its agreement with the conclusion of the Court of Appeals that the decision was not "an unreviewable exercise of prosecutorial discretion." 421 U. S., at 567, n. 7. Our textual references to the "strong presumption" of reviewability in Dunlop were addressed only to the § (a)(1) exception; we were content to rely on the Court of Appeals' opinion to hold that the § (a)(2) exception did not apply. The Court of Appeals, in turn, had found the "principle of absolute prosecutorial discretion" inapplicable, because the language of the LMRDA indicated that the Secretary was required to file suit if certain "clearly defined" factors were present. The decision therefore was not beyond the judicial capacity to supervise. Bachowski v. Brennan, 502 F. 2d 79, 87–88 (CA3 1974) (quoting Davis § 28.16, p. 984 (1970 Supp.)).

Dunlop is thus consistent with a general presumption of unreviewability of decisions not to enforce. The statute being administered quite clearly withdrew discretion from the agency and provided guidelines for exercise of its enforcement power. Our decision that review was available was not based on "pragmatic considerations," such as those cited by the Court of Appeals, see 231 U. S. App. D. C., at 147, 718 F. 2d, at 1185, that amount to an assessment of whether the interests at stake are important enough to justify intervention in the agencies' decisionmaking. The danger that agencies may not carry out their delegated powers with sufficient vigor does not necessarily lead to the conclusion that courts are the most appropriate body to police this aspect of their performance. That decision is in the first instance for Congress, and we therefore turn to the FDCA to determine whether in this case Congress has provided us with "law to apply." If it has indicated an intent to circumscribe agency enforcement discretion, and has provided meaningful standards for defining the limits of that discretion, there is "law to apply" under § 701(a)(2), and courts